Any person denying PSA is preaching a false gospel. They generally need to use lots of nonsensical and antibiblical jargon to try and pull off their errors. Romans 16:18 comes to mind.
Here is an observable fact, those who deny these truths have a plethora of inconsistent false teachings in their camp. They like, endorse, applaud even those who preach a false gospel and false Christ. There is a deep antipathy of truth witnessed in said behavior.
As for the Reformed, since the teachings are truthful and biblically accurate there is both a consistency and deep affection for truth. Paul's example in 2 Corinthians 2 and 4 show the example we follow of not peddling the word, not preaching ourselves, handling the word right, a complete antithesis to the other camps errant methodologies.