LIruka stupid af tho. His words mean nothing Hiruzen is nothing but false hype.
Hiruzen is backed up by manga facts
But he doesn't have to display feats when different people including Orochimaru praised him for all the jutsu he learned. Orochimaru has never been wrong when it comes to measuring power scales.The 'fact' here is he knows about all Jutsu in Konoha but when I'm talking about 'feat' is what he can display that enable him to earned the title 'God of Shinobi'.
The difference between Hiruzen and the others is that he used all elements on a large scale, not a single Kage was able to defend against the wood statue except him and he was a old man.You can use all elements where other people cant but it just in a small scale, how's that can enable you to earn that title? Think about it.
He cut through shinju roots like a Susanoo bladeHashirama was called as God bcus of his Super gigantic Jutsu(feat he showed in the flashback). Before Edo Hiruzen happen, Old Hiruzen never showed any great feats to back up that 'claim'
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He also smacked Kurama across the village like an avatar
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Able to use all basic elements at a high level despite not being a Rinnegan user
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Only people with stronger feats than him are transmigrants. No one surpassed his strength unless they had the power of a "god" themselves, that's why shinobi considered Hiruzen a shinobi god