Does Satan actually change when he appears as an angel of light?
No. Satan does not actually change; he is transformed only in outward appearance, appearing as an angel of light. He presents himself as the one to be worshipped and listened to, yet he remains Satan. His deception is external, not a change of nature, and his ministers follow the same pattern.
Les explains that Satan himself is transformed into an angel of light. He appears as though he is the one to be worshipped and the one to be listened to, but he is still Satan. Les says Satan doesn't change except for his outward appearance. The same pattern marks the false apostles and deceitful workers who transform themselves into apostles of Christ, using seemingly right terminology that is totally empty of doctrine. Since Satan is driving this, his ministers also appear as his, and people are confused by the outward appearances.
And no marvel; for Satan himself is transformed into an angel of light.