The cult has been going mad over this: Donald Trump keeps sharing a photo on social media featuring a bright-red arrow pointing at the head of a bearded man at his civil fraud trial — claiming he is the son of the judge. The Post can now confirm that the pictured bespectacled, well-groomed target is not the kin of Manhattan Supreme Court Justice Arthur Engoron. I should know — I’m the guy in the photo. Trump, 77, on Tuesday yet again signal-boosted the photo of me sitting a few rows into the court gallery along with an article by a fringe-right activist inexplicably claiming Engoron’s son is “financially benefitting” from being given a “prominent” seat at the trial. The post went out to Trump’s 6.52 million followers on the Truth Social app. It was the second time within a month that the former president shared the photo of me and a screenshot of the Nov. 7 article from Laura Loomer, an anti-Muslim activist who once described Islam as a “cancer” and has been banned from social media sites in the past. I was first tipped off to this when Trump shared the post on Truth Social in late November but felt it wasn’t worth giving any air. But after Trump shared it again Tuesday — and upped the ante by including a comment from famously fact-challenged disgraced ex-Congressman George Santos (R-NY) — I thought it was worth setting the record straight. Santos had responded to Loomer’s Nov. 7 story with a “fire” emoji…