“It appears, from a 1942 document… that Hergé gave publishing rights for the books of the adventures of Tintin to publisher Casterman so Moulinsart is not the one to decide who can use material from the books,”

( in Dutch )

https://www.livreshebdo.fr/sites/default/files/assets/docume...

He died. So pedantically you can say he doesn't have any wishes any more, but it's clear they meant that it's against what he wanted when alive.

Well he chose not to make those wishes known in his will apparently, or in any of the contracts which assigned his IP to others.

He did. Hergé wished that the series should not be continued after his death.

Silly me, I thought there was ethics beyond The Profit Motive.

The author owns the copyright unless they transfer it. His transference of those rights shows that he was motivated by profit.