A blog post means it’s real:

An official* logo for HTML (from @sstephenson)

https://www.zachleat.com/web/html-logo/

An Official* Logo for HTML—zachleat.com

A post by Zach Leatherman (zachleat)

Zach Leatherman
@zachleat When did you start hyphenating your last name? (in the upper-right corner of a 27-inch full screen Chrome browser).
@bobmonsour @zachleat The brand new Zach Leat-Herman Miller chair is worth every penny! (sorry)
@chriskirknielsen @bobmonsour haha, this is just an explicit callout to how I truncate my name for socials 😅
@zachleat @chriskirknielsen @bobmonsour you misspelled Leet-Herman