WordPress is the most popular CMS, and, at any moment in time, especially lately, there are a lot of people looking for a "WP alternative". I agree that it's not actually compatible, but it seems they tried to make it similar just enough to be able to use the word without 100% lying and attract people that way.
Nobody is looking for wp alternatives, if they were they would have moved long ago, as there are tens of similar CMS's that were supposed to be much "better" on paper yet never took of like octobercms,gravcms,ghost,netlify,wagtails,etc
