Tom Dehlinger made a brief remark in one of his newsletters a few years back that he had too much respect for the intellect of his customers and the backs of his employees to use oversized bottles.
Plus extra shipping. Crazy, I certainly don’t want to pay for it.
After moving 300-400 bottles over the last two weeks to our new house and loading up a couple wine cooler units I am not sure what is more frustrating, stacking pinot/burg bottles or trying to get some of the oversized California cabernet bottles to fit into double deep shelving. Not only are some of these cabernet bottles getting wider, they are also getting longer with a high shoulder to the point where you cannot get them to sit properly when staggered neck to neck.
As a comparison, all the Bordeaux bottles fit perfectly.
Oh, what a serendipitous moment!
No sooner did my brother send me a funny internet link when I saw this post! 
As for the legitimacy of the wines themselves, I noticed that the winemaker also is behind a B&B/winery in France:
As far as fattest. Champagne Special Club bottles are the widest I’ve had in my cellar. They’re a pain to rack with any symmetry.
I broke down and bought a separate set of racks for the wide-bottom champagne bottles. Works great (though as usual I underestimated the capacity I would need and am ordering another set)
2014 PYCM.
We did the same, and dedicated some racking specifically to these bottles. Better to address it head on than get frustrated again and again.
The amount of coverage these are getting right now it’s getting crazy. I had to make some edits on my Delectable feed to stop getting bombarded with posts pushing the 40oz rose and muscadet. I have no idea if it’s any good or not and wish them all the success in the world, but the hype was getting too much.
The 2014 Caroline Morey might be even bigger. Grr.
I had no idea that this was an established internet “thing”.
As for the OP, I worked in a gourmet food and wine shop for ten years. We had horrible metal grid-like racks for the wines, and oversized bottles often had their labels scraped/damaged trying to get them in or out of the racks.
When a liquor distribution company brought us a similar display to hold a particular brand’s wines, we refused to allow them to pick it back up later, as only it could accommodate the wider gauge of Champagne and other wine bottles!
In the end, we had to move all the empty wicker gift baskets from the tops of the shelves to store our ever-increasing inventory of fat glass bottles. Even with wooden boards laid on top to stabilize the surfaces, bottles often fell off, permanently staining the ancient tile floors.
Alto Moncayo uses bottles as oversized as the wines inside them.
I bought a few Au Bob Climat chards recently that were in a mega oversized bottle. Somehow, that seemed like an odd fit, for a traditional producer making restrained wines.
That explains why North Korea has been ordering that wine.
If I were King everything except Champagne would be bottled in a modest Bordeaux size bottle. And while I am at it no more wax seals. 
Ruinart
Travaglini gattinara comes to mind as having a unique shape.
Are they any worse that Taittinger or Dom P? I’ve never measured but they look about the same
Corison. The 750s nor the mags fit in my very regulation sized keepers. Too long, too oddly shaped. Fall out when I pull open the drawer.
Patrick Cappiello from Rebelle and Pearl and Ash is behind them. I have had the Muscudet and it is fine and well worth drinking a hot summer day. The bottle is fun.
Not that anyone is going to age them, but the Miraval rose bottles are the widest I’ve seen. They are wider than some mag bottles I have.