Something you can always count on are guy's looking for their 15 minutes of fame in lifting. Delusional and void of any sense of reality, in most cases. More so in the mad doctors case, it looks like. Given his aged, his half pullup is respectful, but not a world record. Neither is the younger, tall gentlemen, within the range of a world record. Some very powerful men approach the 300lb range, in regular training, for sets of reps. Plus including their usual heavy bwt, most impressive. And they don't have to send video clips out on the net to prove themselves. Been told the record is a bit over 300, though not really sure of this.
Which kind of reminds me of the tools who are doing a 1/8 to 1/4 rep in the bench ,with 400, and think that this is some ultimate feat of strength.