I don't disagree with what you said, but for context: when these players do speedruns they typically start from 600 ELO and work their way back up to GM, so the

I don't disagree with what you said, but for context: when these players do speedruns they typically start from 600 ELO and work their way back up to GM, so they face players at every level as part of that 100-game streak.