I don't see any reason why the story wouldn't be true.
I have no doubt that there are plenty of bots out there, but I think a lot is about ratio. NL is not a solved game, so I imagine bots are made to play exploitative against weaker opponents at lower limits, and thus play fairly predictably.
I don't think the problem would be that they are unbeatable , but rather how many of them are out there, which I don't know. 1 or even 2 bots on a full ring table is probably not the end of the world.