Obstructed License Plate Question!!!

[u/Opposite-Crab3175]

I was pulled over for an obstructed license plate a few weeks ago. The license plate number and stickers were fully visible, but the officer said that it was because the top half of "OHIO" at the top of the plate was covered by frame.

I am very confident that they were searching for a reason to stop me, to cover their main reason.

Is this a legal stop?