Trump' signature can be very difficult. There are definite good, definite secretaries, but sometimes a wide gray area in between. And it has changed over time.
I believe this signature **MAY** be good, but I am not certain. In my opinion, it is consistent with the signatures in the signed editions below. I believe the same hand did them all including the one posted by the OP. It would not be the first time a secretary did signatures for a signed edition, but I am leaning they may be good.
I still believe these are secretarial. I have books signed 25 to 30 years ago, and if you compare them to the signature you see on his executive orders, there is a style and slant, especially in "Trump" that is consistent and not existent in these. see below:
Good point Terrier, thanks for your insightful input! I'll definitely pass on this one due to the uncertainty surrounding it. Hopefully, someday I'll find an authentic one that doesn't break the bank!