What proof do you have? On what planet would major banks piss off the most capricious and unrestrained president in modern US history? What possible upside could there be for them? Trump (34 time fraud felon known for scamming everyone he can and using his position in government to massively enrich himself) was almost certainly "debanked" because he is doing more of the same shady shit that he's known for and the banks are obligated by the law to treat him like anyone else.
Capital One closed hundreds of Trump's accounts in 2021. Trump is suing them, claiming it's a political debanking. CapOne fighting back because they feel their AML team was correct to close those accounts.
https://www.reuters.com/legal/government/capital-one-says-it...
https://www.snopes.com/fact-check/capital-one-close-trump-ac...
Given the type of things vocal people believe, no, posters must know we cannot assume people be joking.
No, if this was serious, it would read "he was definitely debanked for political reasons. He was not laundering money". Or even better, it would have deflected and claimed something unrelated about Hunter Biden or Hillary Clinton.
Although I have to grudgingly accept that not everybody is fluent in sarcasm.