Having flown on the A220 perhaps 20 times in the last few years with various airlines(and perhaps engines ?) I have to say that I didn't notice anything markedly more loud than other A320 family aircraft, but on listening to a few 'shorts' on YT just now, yes it does make those sounds at certain moments. Tbh, I always found the buzzsaw clunking of some of the other types more disconcerting. Otherwise the A220 seems to be a pleasant aircraft to fly in, internally very 'Airbus', so I'm sure many passengers would just think that it was an A320 family aircraft.