I think a sign that someone is not tactically strong enough is king-defense-weakness.
Here is another game, on FICS, seems like a continuation of my last Round 2 game, where someone plays moves that look “positional” but don’t defend the king.
I blundered my rook at the end, but he didn’t see it. I took the wrong rook but should have been winning easily by taking the right one. But this is what happens when one makes a move in 12 seconds, not realistic for OTB play.
I was never sweating it in this game as his attack kept developing my own.