You seem to be interpreting the statements as technical comparisons of the languages, but ch4s3 was (by my read) commenting on the overall ability of a programmer to jump from one language to another.
That is: they aren't similar languages on a technical level, but if you know Rust, you should be able to make the jump to Gleam pretty quickly.
Aye, I am saying that jumping from Rust to Gleam isn't easy because the languages are so different. "How do I do X in Gleam like I would in Rust" is one of the most common categories of support question from newcomers who assumed they were similar.
It can take a moment to understand that things are done quite differently in the two languages due to being so different: https://gleam.run/frequently-asked-questions/#How-does-Gleam...