No, he most likely was not.
I’m sorry. I misunderstood what you were doing. I though you were repeating his name while gazing at his seal.
Repeating a spirit’s name in your head can make them aware of you, but in itself, it will not summon them. If it did, then anyone who has ever watched the movie Heredity, and thought about King Paimon, would end up summoning him.