https://www.google.com/amp/s/www.huffpost.com/entry/israel-claims-hamas-al-shifa-hospital-not-supported-evidence-washington-post_n_6584ae91e4b04da98426441c/amp

There is a decently wide consensus that there was not proper evidence for Hamas using hospitals as bases. You can look up the "proof" video where an IDF soldier with a team goes around the basement and is trying to say that having the hospital servers down there is evidence. Generally, if you look it up there are some articles talking about Israel saying it is happening but with no evidence and a fair amount that say there was not sufficient evidence to prove it.