When I signed up to Zwift in Oct '20 I just stuck in what I thought my height was in cm because it was just training and it didn’t really seem to matter to me to be 100% accurate, now I’ve started racing a bit I thought I better make sure it’s accurate and so measured my height, for the first time in I don’t know how long, but maybe 20 years. I’ve always told everybody I’m 5’8", just realised I’m 5’7".
Recently I was purchasing an expensive pair of Assos Bib shorts and needed an accurate height measurement to determine proper fit. I was surprised to discover that I had shrunk as happens to us all with aging. I changed my height without any problem. It would seem that within reason height can be adjusted.