If I was sure it was heartfelt...yes.
Sometimes, we are unable to be present when we wish to tender an apology. Incarceration, time, distance and finance, or personal shame, can all be valid reasons why a 3rd party might be needed to make it so. It would mean something to me that they went through the effort to enlist an intermediary to ensure the apology was tendered by a human and not some distant, impersonal, electronic media.
I don't think it serves us well to be overly analytical in situations like this. If they stand to gain little besides a clearer conscience I'll take it at face value. It means something to me that someone who is in such straits that they cannot meet with me vis-a-vis, but didn't avoid the situation and even enlisted someone to ensure the apology was tendered. I've met the 'good actors', and usually their true motivations are easy to figure.
Remember...you have the choice to accept or reject that apology.