It won't stop everyone but any realtor doing due diligence will likely see it. If is lasts long enough, it will show up on Google street view as well.
The problem is that a 4x8 plywood sign will weather very fast in New England weather. You're better off following the article's suggestion of flagging the property with the court.
BTW: When these scams happen, you can sue for the irreplaceable value of trees removed, especially if you planned on keeping the lot wooded: https://law.justia.com/cases/massachusetts/court-of-appeals/...
Regarding the victim, Kenigsberg:
> Kenigsberg received an undisclosed sum. Sky Top Partners gained a clean title to the land, finished the house and made the sale.
> Kenigsberg remains critical of the system that failed to stop the fraud and of public safety agencies that have not found the perpetrators. Under the law it's possible he could have seen the house destroyed and himself enriched more than he was. He prefers to see the case almost as an outside observer, above the fray.