Your twitter quote says - "It is illegal to use the Presidential Seal for commercial purposes."
Yeah, the copyrightlately.com lawyer debonked that.
It's not a copyright question. However, the use of the Presidential Seal at a sporting event could reasonably suggest that the event is sponsored or endorsed by the government. That's the part that's illegal.
Yet as a reasonable person you viewed the pictures from the event and knew that Trump was not the president and that the event was associated with a former president. Other reasonable persons would do the same. It is unlikely that anyone at the event thought they were attending the event of the current President.
The copyrightlately.com lawyer says that Trump can even call himself "President", as is customary for former presidents, in stationary with the seal on it, and get away with it:

The reasonable consumer knows that Trump is no longer president, therefore Trump can use the seal and call himself president. By this standard the reasonable consumer also knows that the golfing event was associated with a former, and not a current, president.