Here are his statements
"The vaccine is one of the greatest achievements of mankind." Trump
"I came up with a vaccine, with three vaccines all are very, very good.” Trump
"I was able to get something approved that, you know, that has proven to have saved a lot of lives. Some people say that I saved 100 million lives worldwide." Trump
You seem to have forgotten that all the Democrats said they’d never take a vaccine that was approved by Trump, back in 2020. There are two assumptions following that: that they actually did, and that they substituted something else that was approved by Biden—and it was indeed Biden’s approved vaccine that went into the public with the emergency authorizations.