That is as 'indicated' a dictatorship as it gets

Serious, agreed, but there are stronger indications. The suggestion that if the houses both agree legislation the PM may not recommend royal assent is replacing a '1Megaton' constitutional breach - the Government may defy the law - with a '100Megaton' one - the PM has an effective veto on anything the houses agree. That would of course apply to all Prime Ministers and, for example, amendments to legislation the PM did not like.