I thought it was the opposite, it's the weakest claim of any bias on it's own. 47 games is not much over a full season's worth of matches.
Teams receiveing zero red cards across a full season:
23/24 - Luton
22/23 - West Ham, Arsenal, Brighton, Bournemouth, Southampton, Forest
21/22 - none
20/21 - Liverpool, Burnley, Leicester
19/20 - Chelsea, Burnley Manchester United
18/19 - Chelsea
If these can play 38 with no red card with the full spectrum of refs it's the same as a team going 38 with the same ref and not getting any, unless we're saying all refs were favouring these specific teams in these specific seasons.
With no red cards in 18/19 and 19/20 we know Chelsea went at least 76 with no red cards, same wih Burnley combining 19/20 and 20/21.
If you top and tail the endings of previous seasons/beginnings of following seasons I'm sure quite a few more of these teams went 47+ without receiving a red card at all. Whether it's with one ref or all refs, going 47 matches without a red is very doable.