It's a general approach to names with numbers at the end, the list is full of those. I'm almost more interested in the more specific patterns like name(69)+, because was there an alt name6969 he wanted to block but an unrelated name67 he wanted to avoid?

¯\_(ツ)_/¯

On top of that, [0-9]+ matches one or more digits and ()? matches the contained token zero or one times, so the whole thing combines to zero or more digits, which is just [0-9]*. They're even bad at regex.