Galatians 1:8 But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!
1 Corinthians 4:6 Now, brothers and sisters, I have applied these things to myself and Apollos for your benefit, so that you may learn from us the meaning of the saying, "Do not go beyond what is written." Then you will not be puffed up in being a follower of one of us over against the other.
So your task should be easy. Simply show that that apostles taught the assumption of Mary and that it was written. The site you referenced did NOT show either of those things. I will therefore consider the teaching of the Catholic Church to be accursed just as the Holy Spirit through Paul told us to do.
“we have preached to you”
Right. Not sola scriptura.
“”Do not go beyond what is written.””
Which appears to be about Paul’s writings to Corinth he just made about man’s role in God’s work.
“Simply show that that apostles taught the assumption of Mary and that it was written.”
Ah, just predicted now the claim is about sola scriptura when that was not what was demanded earlier. Since sola scriptura is no where taught in scripture it is self-refuting. Since you asked for the teaching - and were given it in a previous post (a direct link that is) - your question was answered. Changing your question now to be about sola scriptura won’t help you.
“I will therefore consider the teaching of the Catholic Church to be accursed just as the Holy Spirit through Paul told us to do.”
A typical anti-Catholic probably would consider “the teaching of the Catholic Church to be accursed” in any case. Bigotry closes the mind after all. Anti-Catholicism: lead paint chips for the mind.