No they don’t, until a song spreads around the ground. Most people in those premium seats, and most fans in seats in other areas around the ground won’t stand up on their own and sing and join in with a song that starts in SS1, unless it keeps going and those blocks join in, then most fans join in.
However if those seats are right next to the singing area,I think those same fans would join in almost immediately with feeling self conscious. I’ll admit I’m talking about people like me here, but there are plenty of us, that maybe want to join in but are waiting for those around us to join in too. Those buying 93:20/ Joe’s type seats in that area would IMO be the same. Its contagious, in the same way a Poznan is, but many don’t start Poznaning until it reaches them.
If that's what you think fair enough. But I can't see a few 100 hospitality City fans standing up and joining in with the singing constantly at the front of the stand. I'm glad you can.