If they did not validate they would be at risk of including invalid transactions in a block. So technically, they do validate transactions in the block solving. But you are correct in a general sense -- miners do not validate transactions for the network.
Here was another attempt at describing what miners do:
Full nodes validate transactions. Miners do work that can be proved cryptographically. They build layers of digital walls of energy.
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You right. I think for newbies and newcomers it's better to tell them this because of all garbage articles in msm media about bitcoin they just think miners validate all tx on the network and are not even aware of nodes.
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