I read somewhere that he could be to blame for the poor economic state of Africa even into today’s times

I believe the historian's answer to this goes, "haha, no". More can always be said about Mansa Musa, if anyone would like to address the Internet's favourite Malian king, so if you'd like to write up your own post on this matter, please don't hesitate to do so!

For the meantime, OP, I commend to your attention two particular threads on just this question:

• u/davepx analyses what Musa brought and the effect on the market;
• and u/mikedash examines the story itself and the context we should place it in.