BRF opened up on February 3rd. Patch 6.1 came on February 24th. Tier 17 was in the game with the launch of WoD but just not enabled. Everything you keep point out as "obvious" is just your opinion of what is happening. It doesn't prove anything as fact or anything at all. It doesn't matter if a patch added a new zone or not. There is no set rule that it can't be added in a patch X.1. X.1 patches have seen zone revamps which for all intents and purposes is a new zone. Did you even play 5.1 Landfall? Or 8.1 Darkshore? The only pattern is conspiracy type of connections.
Are you really trying to make the claim that retail won't lose anymore players? lol.That would mean there are still plenty of people left after the content drought Shadowlands is having for several months now. People that stayed until now in retail will stay for 3-4 more weeks or even longer as they seem to simply not care if there's a new patch or not, they're just subbed. The critical amount of people left Shadowlands 2-3 months ago when 9.1 should have went live.
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Which means they are tanking MAU just to see one specific product have good numbers. That doesn't make sense. Both Retail and Classic can have good numbers at the same time.