It's been confirmed multiple times from multiple sources that Gaza's largest hospitals are connected to Hamas' tunnel network. The UNWRA, various doctor groups and various media outlets had reported it prior to this most recent conflict.
For someone moderately or more paying attention there should have been no reason to doubt those claims from the IDF; not just because they cane with nominally verifiable audio and video evidence. But also because Hamas has never refuted claims about its use of its tunnel network in and around hospitals, schools and other civilian infrastructure.
They also stopped teaching typing in schools. My younger family members never had an computer class or a typing class.