Re: MARK - Is this a valid mark ?
201718 Definition The player must make a clean catch direct from an opponent's kick
2018
17.1 (b)
Catch a ball that has reached the plane of the 22-metre line directly from an opponent’s kick before it touches the ground or another player
The law appears to have changed so that the referee no longer needs to decide if it was a "clean" catch.
The bit about touching a post first was in the 2017 law as well, where it clearly meant that touching a post did not make the catch indirect.