Can you post a source about either of those claims? I’ve found nothing to support either of them.

Telegram does have E2EE chats (called Secret Chats), though they are only one-on-one, not enabled by default and their encryption is dubious.

Allegedly the former. By “allegedly”, I mean that Telegram is definitely uncooperative in moderation of illegal content, the alleged part is that that is the motivation behind the arrest. I also read somewhere that he was accused of tapping into Macron’s manager’s communications, but I can’t find the article and I don’t know how reliable that statement is.