Area code 561 is for Palm Beach County, Florida, so I was thinking it might be the number for the specific broker assigned to this specific domain... and the other number was a default number that never changes.
However, I then googled the entire number and found this on twitter (2019):
Yum.ca is being held at GD but that specific number might have something to do with the domain being listed on Uniregistry and not Afternic? Not sure and I can't remember what the number might be in other instances.