“it plans to change the pricing of its Twitter Blue subscription product to $7 if users pay for it through the web and $11 if they do so through its app for iPhones”.
Basic math:
A 30% “premium” would mean 7*1.3=$9.10 blue check cost + App Store premium.
A 57% premium would mean 7*1.57=11$ blue check cost + App Store premium + Ultra premium.
Basic playing with Media math:
Elon Musk speak with purposeful if not comical intent + Media eat it up getting lots of clicks = eeeeeveryone wins! (Shhh, don’t let the secret out that the blue check will cost the same).