No, it didn't. Bozza put up a photo of a proposal for return rules on another thread but at no point were there announcements about no singing at the Chelsea game, nor were there any signs preventing it. Other Covid protocols were clearly called out with announcements and signage.
So, it looks like a possible answer to the OP's question is "everywhere is different". Different populations and governments, same Covid.
The "little bit of politics" answer may be that we have a populist government who are suddenly unsure as to what is popular. Dom won't have been able to run...
Watched the NFL last night and quite surprised to see fans in some stadia. Kansas City have had them in all games and averaged around 13,000 in the ground. State of Missouri new cases have hovvered between 1000 and 3000 ish a day recently.
I've no idea of the actual dos and don'ts in Missouri...