Proving you’re wrong is easy. On one hand sure, supply chains has an effect, but it’s not in the way you’re thinking. To prove you’re wrong, you can see the spike in demand after stimmy checks where given. This is what made economists describe the situation as the “bullwhip effect”:
which was guessed because the stimmy checks is the “free money” that increased demand uncontrollably, which led to inflation. I remember seeing the spike in demand in Target financial reports after stimmy checks arrived. These chains had an unexpected spike in demand and revenue in these times. If it’s supply chains like you’re saying, this wouldn’t have been the case.