Property valuation

The broken property valuation system is broken, has been broken. BUT let’s say it was the pandemic.
https://www.wowt.com/2021/03/30/pandemic-the-cause-for-soaring-property-assessments/?fbclid=IwAR1zW1HNMERM3ZPkHtueqPRh9ERZGggwRWx0yJEpvWoNL3JRTqXo4UctyWE
It wasn’t.
Property shouldn’t have a change in valuation after purchase, unless structural improvements/changes are done.