Ultimately, the odds I think are as follows:
Both win > Trump loses/Perdue wins > Both lose > Trump wins/Perdue loses
It's also possible in some remote universe that Trump wins and Perdue loses, even though Trump gets a lower vote share (whether that be through a higher third-party vote share in the presidential, or Perdue botching a runoff).
Perdue is more likely to carry Trump over the finish line than vice-versa, but Perdue of course doesn't want what is already a millstone around his neck to become an even greater liability by depressing base support, turnout and dollars. I doubt he's going to go out of his way to say anything publicly rebuking the President, but that's probably the best hole through which to thread the needle in a state like GA. I don't see him gaining anything in net terms via virtue-signaling like Heller or Manchin. It's all about avoiding land-mines on both sides of the fence.
That Politico article was surprisingly transparent in terms of showing his thought process & campaign strategy:
“Republicans have made a mistake in the past by running away from this president. I don’t see any need to do that,” Perdue, the first-term Georgia senator, said in an interview. “I support this agenda. I don’t support everything he says or how he says it, but this agenda is working.”
Those 3 sentences are probably the most succinct way to summarize his thoughts - and probably the most effective strategy when dealing with the Trump effect in GA.