he still landed flush several times 42 sig.strikes to the head and didn't ko him.
He has 27 kos in 57 fights in kickboxing.
Kopylov isn't a brawler type, he fights very methodical and patient, this looks like a fight where you see two guys throwing mid to low volume and being hesitant to let the combinations flow. Plenty of no name kickboxers went the distance in his kick boxing career who were average. Even his last fights in kickboxing were decisions, so to put it short, he's not a heavy hitter, just when he fights non strikers or mma generalist.
I'm not saying it's impossible, but numbers show it's unlikely