Neither answer actually addresses its question:
Completely matter of opinion. Both identical answers do address the questions imho.
In the first case, the question specifically asks about connecting to thru-holes without solder, whereas the answer implicitly requires soldering header pins.
Soldered header pins are not required, press fit, or offset pins that are held by friction is enough, and you could wire it around the edge holes. Even if we don't assume it's 100% correct, the answer is still on topic, and "not an answer" answers normally aren't even on the same planet (It's a little wrong to say a tomato is a vegetable, it's very wrong to say it's a suspension bridge.)
In the second case the question is asking for PCB inter-connectors, and the answer rather clearly misses the mark.
Wire wrapping is a valid PCB inter-connect method. It predates most other newer methods. NASA still uses it!. That answer is 100% on topic to OP's question.
Your actual concern:
Is it Spam? Sure, it could be. But! THATS NOT ALWAYS A PROBLEM. Specifically from the rules regarding self-promotion:
The community here tends to vote down overt self-promotion and flag it as spam. Post good, relevant answers, and if some (but not all) happen to be about your product or website, that’s okay. However, you must disclose your affiliation in your answers.
If OP happens to spam his website on more, lets say a nice arbitrary 5 posts, then custom flag for a moderator to review, and maybe they will shoot them a message or warning. For the most part, it looks like someone just passionate about a technique they use. No overt ads on their website, not spamming unrelated multiple posts, and they aren't even selling it.
Side note, the user in question has a few posts across Stack Exchange over a few years and none are off topic or questionable.