After Elon Musk took over the company, there has definitely be an increase in hate speech . There has been research done into the usage of hate speech on Twitter after Elon Musk. According to a CNN Article, which cites this research, “ The Center for Countering Digital Hate and Anti-Defamation League both said in reports that the volume of hate speech on Twitter has grown dramatically under Musk’s stewardship. Specifically, the Center for Countering Digital Hate said the daily use of the n-word under Musk is triple the 2022 average and the use of slurs against gay men and trans persons are up 58% and 62%, respectively.” This also corroborates with the evidence you have provided from the Brookings Institution.
However, I want to make one key observation about the claim. There is definitely a correlation between the increased hate speech and the arrival of Elon Musk. However, it can not be concluded that Elon Musk is the sole cause of this increased usage. As denoted in the claim, you stated “because of”, which indicates Elon Musk is the cause of the increased hate speech. In simpler words, even if the research finds that there was increased hate speech when Elon Musk took over, it is only a correlation between the events; not that one event necessarily caused the other. So, your claim is correct that there is a correlation but is it the sole cause, that difficult to tell.
Link to Article: https://www.cnn.com/2022/12/02/tech/twitter-hate-speech/index.html