In Islam — and even in basic human manners — we are taught to judge actions, not hearts.
Khaby simply thanked Allah for helping him through hardship. There is nothing deceptive about expressing gratitude to the Creator.
If you disagree with someone’s beliefs, you can express it respectfully — but declaring a person to be a tool of Satan without evidence is not from the teachings of any prophet.
May Allah guide us all to speak with wisdom and fairness.