I'm aware that Telegram is not E2EE by default, and you have to turn it on manually. But it's not true that Elon has long been rallying against Signal. In fact, he endorsed Signal a while back along with Edward Snowden. He also later criticized Signal, as well as other encrypted messaging apps. I remember seeing a podcast clip of him saying something along the lines of "none of them can really protect against the government spying on him", which is true. If you're a high profile individual like Musk, nation states will expend lots of resources to spy on you, and no messaging app will protect you from that. The point of encrypted messaging apps like Signal and Telegram is to raise the per capita cost of doing surveillance so that surveiling the entire population becomes prohibitively expensive, but it doesn't prevent targeted operations on an individual by determined state actors. Having multiple options for those apps is a good thing, even if the apps are individually imperfect, because the government will have to deal with multiple apps instead of one, and that takes more resources.
As for the rest of your comment, those claims aren't true, at least not in the way you stated. DOGE has been accused of mishandling sensitive records, and that part might be true, but I've not seen any evidence pointing towards the mishandling being a part of a evil plot to strengthen the surveillance state and promote fascism. Mass surveillance was already a problem back in 2013 when Snowden leaked it. In fact, it was already a problem before Obama's first term, and Snowden held off on leaking it because he thought Obama would introduce reforms, which didn't happen. The surveillance state is not a recent fascist movement spearheaded by Musk or DOGE. And I think a lot of the vitriol towards Musk is manufactured. He occasionally lies and is prone to manipulation like everyone else, but he's not the supervillain you think he is.