nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqueay9ps6kx46alc3wasua9xrljlgpt5ycu7stj9sfn9lrev7xzlqeqzqy9 Adam Christopher Sheafe and that tat is in Hebrew
Writing YHWH as a stand-in for the full Tetragrammaton (יהוה) is generally permitted, especially in non-sacred texts like articles, books, or notes.
There are several ways they can get around it and still be kosher. Specifically, they don't classify English as a language and, therefore, the Tetragrammaton hasn't really been written down; which is just pilpul and business as usual. Also, their commandment is to not deface the name of God or write it spuriously or in a way that it can be defaced or blasphemed. https://www.jewishvirtuallibrary.org/the-name-of-god
Also, religious people are not really known for following their book in total.
Do you happen to know this guy's name? We can confirm.
Discussion
My finely tuned jewdar does not activate when looking at this man. You may be right.