You’re confusing different things. “Contact tracing” has nothing to do with touching things. It just means you had some kind of contact with someone who had covid. Not even physical touch, just being relatively close.

Covid does not spread well through surfaces. This created huge waste as people were trying to deep clean with isopropyl alcohol, resulting in isopropyl alcohol shortages and companies putting in more dangerous forms of alcohol in hand sanitizer. It was completely unnecessary.