One is usually too busy setting up a departure under time pressure to have time to even consider what HF frequency is on- selcal is automatically covering HF. I have had at least a couple of incidents of HF selcal going off during takeoff- we just looked at each other and cancelled it. It is not a reject issue and I wouldn't dream of doing so.
Every departure is emergency briefed. Reject up to 80kts for problems is more likely than above 80kts where specific items are reeled off. Faults should be confirmed or backed up by other indications. A take-off reject for a selcal call, even if I had previously checked selcal with a ground station, is not on my list of priorities at all- I would not do it. That is why I was in disagreement. Sorry, but in my opinion, it is daft- nothing less.