Using a hyperlink is not neccessary to break the rule. Naming a Mastodon account (or any account) is not neccesary to break the rule. Breaking the rule in the same way that it was broken in the examples given is not neccesary to break the rule. Elon stated in various places that attempts such as PG's to break the rule (which is about the promotion of prohibited social media) without getting banned would not be tolerated. In one instance he referred to such an attempt as 'ban evasion' (this was in a Twitter space, I'll find it when I'm back at my PC).

Elon's phrase "casual sharing" is not inclusive of PG apparently denouncing Twitter and promoting his Mastodon account in its place. PG's Tweet was anything but casual. If PG had linked to some post he found interesting that happened to be on Mastadon, that might qualify as casual.

I never claimed that my use of the phrase 'ban evasion' matched the use in the Twitter user agreement. HN and I are in agreement on that count (as I have stated elsewhere in this thread).

Frankly, you have bad reading comprehension, most likely due to motivated interpretation i.e. you tend to see what you want to be there rather than what is actually there.