I can pretty much guarantee someone would have brought it up if they didn't

"they cant make the decision to cancel a match on gameday, who do they think they are, grumble grumble murmur murmer"

If there is any club Rugby League played in this country in 2020, I'll eat my proverbial hat.

So with Leeds games in hand and superior points difference will they be crowned as champions ?

No

A double whammy if your a united fan as well

It's a little different f0r Leeds United, as the bulk of the football season has been played, although, unlike Liverpool in the Premiership, Leeds ,although top, would not be certainties to remain there if/when all games are complete (should that ever happen).
The RL season is still in it's infancy, with Leeds having completed just 5 games out of 29 and they're not even top of the pile, albeit with a couple of games in hand.

Not sure when it becomes "fair" to award a title for an incomplete season but, 80/85% would be a reasonable line, 15% (approx.) is not. Dont blame him for trying though.