They're probably referring to what Square's preferred methodology regarding how they want people to use the forums is, which he is correct on.
Yoshi-P has stated numerous times across LiveLetters that tons of individual topics spread out are more likely to be ignored by dev feedback than single, huge threads where all information can be easily compiled instead of having the people in charge of compiling community opinion/criticisms/etc chase down hundreds of topics to compile information. With that in mind, necro'ing & posting in older topics if they have relevant discussion to add is precisely what the devs want people to be doing.
That being said, that one guy basically never contributes anything to the threads he bumps, so that'd be a different topic to argue.