As Buddhists, we should not take seriously those who engage in unsubstantiated speech. Whether or not what the poster said is true according to his beloved Abhidhamma Commentary is irrelevant. The poster has not provided any links to relevant texts, which makes their speech unsubstantiated.
At the DhammaWheel links, in defenseofdefense of this unsubstantiated speech, another poster of unsubstantiated speech said:
What Eko Care has said is correct according to the Classical texts. The conceptualizing in mind is the impermanent one, but not the Conceptual-object of Conceptualizing-mind. Pannatti is an object. This fake object is perceived by the impermanent mind.
In the Suttas, all conditioned things are impermanent, including objects perceived by the mind. There suttas explicitly on this subject, such as:
If anyone says, ‘mind-objects are self’, that is not tenable.The arising and vanishing of craving is evident...
MN 148
Bhikkhus, Forms are impermanent... Sounds … Odours … Tastes … Tactile objects … Mind Objects are impermanent. What is impermanent is suffering. What is suffering is nonself.
SN 35.4
Ignorance is impermanent, conditioned, dependently arisen, subject to destruction, vanishing, fading away, and cessation.
SN 12.20