Miyazaki is a literal communist. He supports the JCP. It’s the subtext of like half of Studio Ghibli movies.
Miyazaki himself also became somewhat more moderate in the early 90s while working on Nausicaa.
Many post-Communist parties in Europe, like Germany's die Linke, have done much better. But unlike the JCP, they've also employed branding consultants and dropped the word "Communist", the hammers and sickles, etc.