I just don’t see how it could be speaking of the tribulation. That’s not Paul’s mission for Christ. His mission is the creation, care of it, and when and how the Body of Christ will be taken from this earth.(Rapture).
I think there is a day if the Lord for the Church the Body of Christ, when He comes aaand removes us from the wrath to come
There is a day of the Lord for those going through the tribulation and His second coming.
I agree with your point, Paul being the Apostle unto the Gentiles. But everywhere Paul went he was confronted by Jews attempting to bring Christians back into bondage.
Wasn’t Paul also trying to reassure those who believed the Rapture had already come, that indeed it had not.
You could be right. Something to consider.