You should explicitly state who those people are, what illogical things they have written, and why they are illogical.
I think it's very likely that people who can plausibly be considered "heroes of the rationalist movement" have written illogical things. But I don't know which specific people and which specific things you mean by that, so I don't know if I think you in particular are correct in your judgement or not.
Using first principles thinking and steelmanning are just rhetorical techniques for persuasive thinking and writing. Even people who are unfamiliar with those particular pieces of terminology do them.
I think it's very likely that people who can plausibly be considered "heroes of the rationalist movement" have written illogical things. But I don't know which specific people and which specific things you mean by that, so I don't know if I think you in particular are correct in your judgement or not.
Using first principles thinking and steelmanning are just rhetorical techniques for persuasive thinking and writing. Even people who are unfamiliar with those particular pieces of terminology do them.