Yes. And just to be fair I also found a Catholic website, the Catholic Encyclopedia, which also casts doubt on the Ignatius Epistles.
"... Of later collections of Ignatian letters which have been preserved, the oldest is known as the "long recension". This collection, the author of which is unknown, dates from the latter part of the fourth century. It contains the seven genuine and six spurious letters, but even the genuine epistles were greatly interpolated to lend weight to the personal views of its author. For this reason they are incapable of bearing witness to the original form. The spurious letters in this recension are those that purport to be from Ignatius."
Catholic Encyclopedia-Ignatius Of Antioch
Strange how you missed this.
Let's look at what it says:
It contains the seven genuine and six spurious letters, but even the genuine epistles were greatly interpolated to lend weight to the personal views of its author.
The Epistle of Ignatius to the Smyrnaeans has ALWAYS been considered genuine.