Thoughts and ideas stand on their own merit, and are worth sharing or criticizing regardless of who produced them. You shouldn't need to know the background of the author to agree or disagree with them, just as credentials aren't required from you to participate in this forum.
Of course it matters when you attempt to use your own social backing to boost someone else. That you're a commenter who has been around since 2018 who is also an "an ambitious full-stack software engineer, with a deep passion for design, user interface and front-end engineering"[1] is definitely a point in your favor, though. What made you personally feel so strongly about the original author? Your reasoning is more likely to help convince others especially if you have sources you can point to.
[1] I'm hoping he'll notice but for everyone else, I pulled this quote from the About page on the website linked from his profile.
