When I first saw this I had doubt But I always said doubt is OK but also keep an open mind. I saw the clip before Northern brewer put out there warning.
I have saw my fair share of the bottoms of kegs and up to this day never saw one without holes in the bottom rim. Until today I had a brewer bring this keg over for some tig welding and other work. When I turn it over I noticed right way no hole's in the bottom rim and none in the top rim.
What really floored me was when I saw this heavy weld 360 degrees around the inside of the bottom rim. Here are a couple of pictures taken with a mirror. Now I do a fair amount of tig welding but this is one mean bead around the inside machine layed .
I think the purpose was to reinforce the bottom rim so it would stand up to repeated dropping off the truck.
I do know this is a sealed vessel that could turn into a real bad bomb when heat is applied if there is any moisture inside.
OK no doubt now. It only takes one and this is one out of a truck load.