Not really. If one of the clients interpreted a part of the spec in a different way, event if they are right, they would have change it to follow an officially approved code because that's the consensus.
"Officially approved" specs are talked about amongst the devs in all client teams on the Ethereum calls, with proposals having to go through the EIP process, which are then implemented by each team.
Right, maybe it's less visible now and Parity is not in use anymore. But it doesn't change the fact and the link proves that it indeed happens. I guess it's a hard truth nobody wants to talk about.
