Welcome to the forum @winkawesome
The rest of the Temporary/Seasonal rejection is “or Not Distinct.” Reviewers may have used this to indicate that this appeared to be just a sign for traffic. they may have used “Fake” because they did not feel this was a “trail marker” as you said. These are just guesses.
I don’t submit anything like this and skip them when I get something like this to review. I am just not clear on the criteria for something like this along a roadway.
If you want to appeal to see what a Niantic employee thinks of the nomination, you get 2 appeals, each on a 20 day counter before you can use it again. If you don’t see the button that says “Appeal” then you don’t have one available, and will just have to wait. You can give that link to prove this is a greenway on your appeal. If you resubmit, you can include that link in your supporting section.
This is the latest clarification Niantic has made on trail markers. It does not give any examples that look like yours to me as either good or not good.