I could as easily read the writings of A. C. Bhaktivedanta Swami Prabhupada on this. Your "Creation Researcher" is doing the classic move of noticing that the data we have is complicated and that horse evolution is different from many other groups because there are very few surviving descendants to falsely conclude that this invalidates the whole concept of evolution, rather than being a weird, non-reprentative version of the thing.
To spell it out, the writers of textbooks took an overly simple example, and that led to the misconception that the cartoon sketch ladder of horses was how evolution worked. (Sidebar, this is what happens in math classes when the first grade teacher says, "You CAN'T subtract a bigger number from a smaller number," ignoring the existence of negative numbers. Some of the students go on to think that this simplified idea is the whole thing, and 5 years later their 6th grade teacher has to do backflips to get them to understand integers.)
Read this.
https://ncse.ngo/horse-horse-course-courseas-long-you-know-what-horse-part-1