I don't really think Ignatius would like it for people to put words in his mouth - or in his letters. If you read the epistle, nowhere is the word "Protestant" mentioned. It was addressing the heretical doctrine of the Docetists who did not believe in the physical body of Jesus Christ. They agreed with Gnostics in that he only seemed to die and that his body was an illusion, he was not truly human. In fact, some don't even call it heresy, because it was not a misunderstanding of Christian doctrine but a way-out-there, woo-woo philosophy. I know of no "Protestant" Christian faith that denies the human body of Jesus, his literal death and resurrection. Those are some of the "biggie" major doctrines upon which all true Christians have unity.
So sorry to disappoint you, but Ignatius would have welcomed me into his flock to participate in their Love Feasts any day!
The denial of the Eucharist and the denial of the Episcopal authority are two characteristic heresies of Protestantism as well, so I don’t think so.