I’d take that as, um, canon.
Not that I can do anything about it. One of the household treasures is a Presidential case clock, and I have it tweaked to phenomenal accuracy for a mechanical movement. I don’t think there’s any way to adjust the striking time to accommodate the different quarter-hour chime lengths, so it would be off for the three quarters if it were on for the hour. (For those who don’t know, clock chimes are four cumulative parts - there’s a first-quarter tune at 15 after, which is played followed by the second-quarter tune at half past, both of which are played followed by the third-quarter tune at 45, and then all four are played at the hour.)
I could adjust it so the first strike of the hour was on the dot, but the first three quarters would be off by a number of seconds. Not worth it. I’ll live with the chime announcing the hour.