The text quoted by FO Bloggs is verbatim from CAR 2(1), up to this patently inaccurate and internally inconsistent assertion (presumably by someone with a bright idea and a desire for a fat logbook):
This [i.e. the effect of the definition of “flight time”] is synonymous with 'chock to chock', 'block to block' or 'push back to block' time.
An aircraft that is being pushed back is not moving under its own power, and is therefore not in “flight” at least during the period of push back, either in terms of the CAR definition or as a matter of common sense.
Perhaps the “moment at which [an] aircraft first moves under its own power for the purpose of taking off” is the moment the aircraft starts the take off run on the runway. Perhaps “the moment at which [an aircraft] comes to rest after landing” is the moment at which the aircraft completes the landing run.
There’s this quaint concept about words meaning what they say.
And then there are all those odd people who think that “flight” only occurs when you’re in the air.
Perhaps the drafters of the ‘new’ regulations need to look to the Air Navigation Act, which seems to have resolved the uncertainty, without the benefit of 10 years of navel gazing:
SECT 3AB Aircraft flights: when do they start?
For the purposes of this Act, a flight of an aircraft is taken to start:
(a) when the last external door is closed in preparation for the first movement of the aircraft for the purpose of taking off on the flight; or
(b) if the aircraft moves, before all the external doors are closed, for the purpose of taking off on the flight—when it first so moves.
SECT 3AC Aircraft flights: when do they end?
(1) Subject to this section, a flight of an aircraft is, for the purposes of this Act, taken to end when the first external door is opened after the aircraft comes to rest on the next landing it makes after starting the flight.
(2) If an aircraft makes a forced landing, its flight is, for the purposes of this Act, taken to end when the competent authorities take over responsibility for the aircraft and for the people and property on board.
(3) If, after an aircraft starts a flight:
(a) the aircraft is destroyed before the flight is taken to have ended under subsection (1) or (2); or
(b) the flight is abandoned;
the flight is, for the purposes of this Act, taken to end when the aircraft is destroyed, or the flight is abandoned, as the case may be.