The title of this post is at best misleading and at worst simply wrong. From the source that OP linked in a couple other comments here (emphasis mine throughout):

Since the start of July, the app's downloads have fallen by almost 30% compared to the preceding two months, according to data from app performance tracker Apptopia. ... Twitter has gained usually 15 million to 30 million users a month since 2011, according to filings with the Securities and Exchange Commission. It gained just 10 million users between August and September of this year. ... Visits to the web version of X, which still operates as twitter.com, fell since the start of the year, with global web traffic down 10% in August and US traffic down 15%, compared to a year ago, according to an analysis by Similarweb. ... So far in September, daily users are down to 249 million, a roughly 2% decrease... Monthly users are down by about the same percentage, now at 393 million users from 398 million in July.

That is emphatically not "loses over 30% of users in two months." That is, though, "signs of slowing growth" and "signs of the most recent round of dramatic announcements wearing off and folks moving on with their lives" which is why Musk is doing his best to get back into the news cycle.

Maybe OP should go ahead and update the post with a more accurate title to avoid spreading misinformation.