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You're technically right, in that if revocation doesn't happen and nothing else happens a hard Brexit will happen, but there's no way Parliament will actually let it happen. Or the government, as the government themselves have said that for no deal to happen they'll need to pass further legislation.
Barring complete dissolution of Parliament it's not going to happen, but it suits May and the Brexiters if people think it could.
No, this is not true. It's very dangerous to spread this sort of misinformation, also.
By automatic operation of law we are out on the 29th.
If we don't ratify the (a) WA by then, then we get no deal.
This situation (barring A50 revocation) is, and has been for almost two years, not controllable by the UK.
In your version, what happens on the 29th? Parliament declare that there are 365 more days in March?