No, The Dryad doesn't see ores and altars as "bad" for the world. Dryad will always interpret it as 1% when there is at least 1 corrupted block. Eventually there should be 1 or a few corrupted blocks somewhere blind, i.e. where you didn't pass or didn't see. You can use Terramap in the browser (from mobile too, but put the page in "Computer Version" (I recommend using Chrome)), there, you use the option to load the world (Maybe it doesn't work on Android 11+ (Because it may unless the site can't access the folder where the Terraria files are, in which case you use a File Manager with access to the Android "data" folder and COPY the file from your world to another place)) and after your world be generated from "end to end" on the site, you go to the "Sets" option and select "Corruptions Blocks (something like that)" and it will highlight in white squares all corrupted blocks in your world (black stone, corrupted sand and ice corrupt).