This is crap. 'Thou' is part of a whole class of pronouns (2nd person informal) that are completely absent from all modern speech and writing. 'Whom' is the objective form of 'who'. I/me, he/him, she/her, we/us, they/them, who/whom. It's not used very often in speech, but it's used every day in formal writing and thus very much alive. There is no disagreement among educated speakers of the language as to which usage is correct and which is incorrect, only disagreement as to which is acceptable in context. Celebrating it's death is celebrating ignorance.