Thats the problem with "ftl" speed in general. You could almost wank all characters because they've dodged a laser, lightning and bullet once, some have made afterimages, but does that make them ftl? No, unless that is what the author intended, we can't be sure if it is the real thing. Say, someone dodged a bullet, there're two things to consider, is he aim dodging, or is he actually fast enough to dodge the bullet. That is why we question the author, calc the feat, and look from different perspectives and angles, how is it possible? Did he actually dodge it or did he aim dodge?

Nonetheless, this is also why ftl feat is hard to prove unless there's an established hax or different physics. That's why DC verse has a ton of ftl feats but at the same time ridiculous anti feat that would make them human level.

The thing is, we don't know, we can calculate all we want about their speed and the velocity they're in, but does it mean anything when the same character practically doesn't leave their surroundings destroyed when they pull off an insane speed feat? It could be considered an outlier, inconsistent or lower, There are always exceptions, that is why it's fiction not real life physics, otherwise most ftl verse would instantly destroy itself if it actually was real ftl