The Onexplayer Apex boot situation is weird
My Apex is extremely picky when it comes to booting. For example, my 145w Ugreen powerbank cannot boot the Apex, but my 65w charger can. Heck, even the USB C port of my off-brand monitor is able to boot it.
I don't think those are rated for 20V/7A. Something else must be going on that prevents most powerbanks from booting the apex.