"By the standards of republican politicians" is a low bar and also a relevant topic. Cotton was more careful with his words than a lot of his comrades but he was very tightly allied with people (like Trump himself) who were well known for spouting complete horseshit. Cotton also did himself no favors when he was one of 6 senators to vote against protection for Asian-American victims of hate crimes.
I mean, he lists four options, and identifies natural release as the most likely and intentional release as very unlikely. And it's expressed clearly, in full sentences.
By the standards of republican politicians on twitter, that's actually pretty good.