Thanks! It's hard to infer their detection algorithm, especially since it seems to vary with location and OS. That's why the extension has many parameters that the user can tweak according to their needs. Can you try to change the "if skip available" value in the extension settings to something else than click button? The safest (to avoid detection) but slowest is do nothing, the fastest but riskiest is boost ad.

Answer to edit: to "block" a video ad we have two possibilities. Either we accelerate it by increasing the playback rate or we change the current time of the video to its end (this is the boost ad). Initially the extension was only doing the former, but it has recently raised issues for some users. So, when the skip button appears, you can either make the extension click it, set the ad time to the end (normally ending the ad), or do nothing.
There is a form in the description that's easier for discussions as we don't get edit notifications. Thanks, we need to provide more docs about the different configs :)