You very well know that this is not true. Bitcoin's security depends on proof of work, and the decentralization of those providing it. Period. Bitcoin has a proof-of-work consensus, meaning, the consensus decisions (ALL decisions) in bitcoin are taken SOLELY by proof of work (mining). Nobody else can decide anything else cryptographically/technically in bitcoin, not any "majority of full nodes" (too easy to Sybil) and bitcoin chose not to be a proof of stake coin, so stake holders have no cryptographic/technical decision power either.
you are soo soo wrong
even if a PoW hash is correct.
nodes can reject/orphan blocks for many reasons.. and they do.
Eg they reject blocks if a tx was maliciously added with no taint(no history)
Eg they reject blocks if a tx was maliciously added which brings the data limit above the size limit
Eg they reject blocks if a tx was maliciously added with no signature proof of ownership
and many other reasons
dino. please go do some research.. pools only collate data into a 'batch' of transactions known as a block.. they then get ASICS to form a special hash and secure it.. so its easy to spot if alterations are made later because the hashes wont match..
its then the symbiotic network of nodes that then validate the block is good, honest and follows the rules where all the transactions held within are correct and the hashes match, amungst other things