Don’t confuse guidance material for the definitive rule. Guidance cannot ‘require’ anything.
Here’s what the applicable definitive rule says:
166C Responsibility for broadcasting on VHF radio
(1) If:
(a) an aircraft is operating on the manoeuvring area of, or in the vicinity of, a non‑controlled aerodrome; and
(b) the aircraft is carrying a serviceable aircraft VHF radio; and
(c) the pilot in command of the aircraft holds a radiotelephone qualification;
the pilot is responsible for making a broadcast on the VHF frequency in use for the aerodrome in accordance with subregulation (2).
(2) The pilot must make a broadcast that includes the following information whenever it is reasonably necessary to do so to avoid a collision, or the risk of a collision, with another aircraft:
(a) the name of the aerodrome;
(b) the aircraft’s type and call sign;
(c) the position of the aircraft and the pilot’s intentions.
Note 1: See the AIP for the recommended format for broadcasting the information mentioned in this regulation.
Note 2: For the requirement to maintain a listening watch, see regulation 243.
If you’re operating in and out of your private helipad, and you know that you’re the only person operating in and out of your private helipad, isn’t the only risk of a collision with another aircraft the potential “overflying low level helicopter and plane flights", when you're inbound and outbound?
I’ll bet that if you thought hard about it, you could come up with some way of letting that potential traffic know where you are and where you’re going, in a broadcast of no more than 10 seconds' duration, in each case.