It's clear Mr Cummings does not enjoy a high level of esteem in the eyes of the electorate, which is hardly surprising since he flouted Covid rules and the insulted the nation with his stupid lying excuses - plus, for some reason, even though he is was an extremely high-level government advisor, he still persisted in presenting the professional image of a nine-year-old skate boarder.
That makes it easy for the 'source' to be believed, but as is clear by the careful legal language being used in the reports, no-one is accusing him directly, so he remains innocent until proven guilty.
It may be true, but it may not, so we can;t really condemn the man for leaking information.
Looking like a child in adult clothes and treating the entire country as though they are completely stupid, yes, but leaking? Not yet.