Twitter doesn't ever claim its bot numbers are 5%. Only Musk says Twitter says that. Twitter says its mDAU (critically important distinction and definition, check SEC filing for what it means) is under 5% bots which is a different number entirely than what you might think of as "bot count". Musk is knowingly and intentionally confusing the two to get people to think Twitter is lying about their numbers. If 50% of the accounts on twitter were bots it would not matter to what Twitter's actually saying in their SEC filings, which is that the users logging in daily using hard clients that display ads is <5% fraudulent.