YouTube absolutely has not solved this issue. Personally, I feel like it has gotten worse in the recent past. Here's a small compilation of fake thumbnails which took me less than a minute to collect: https://imgur.com/a/mjlkM

Edit: It appears like searching for "life hacks" is a good way to find videos with misleading thumbnails: https://www.youtube.com/results?search_query=life+hacks

It is possible to report videos with misleading thumbnails on YouTube, but those reports seem to be ignored, proven by those videos having millions of views.