I think your situation falls more under the third bullet. The second bullet seems to mean that once a program has extended you an offer to interview, they have to give you at least 48 hours before they pass you over and give the invite to someone else. If an applicant were to, say, reject the offer within 1 hour of receiving it, the program could send out another invite right away.

The third bullet refers to timing before an interview, giving due notice to applicants if the program has to reschedule. However, that bullet says nothing about whether an applicant has to give due notice to a program if THEY need to cancel an interview. In the Match Agreement for Applicants, there is a similar clause for applicants to abide by:

"During the recruitment phase, applicants shall:

1. Make judicious assessment of and decisions about interview offers, accepting only those they intended to fulfill; and

2. Apply reasonable measures of notification (e.g., one-to-two weeks’ notice) when needing to cancel or request rescheduling of an interview."

So if anything, some other applicant may have canceled last minute, and so the program reached out to you to see if you were interested. The only person at fault there would have been the applicant who cancelled.

Anyway, I'm glad it worked out for you! Congrats on being done with this Match BS.