No, it is NOT teaching ABOUT angels.
Read the article, especially towards the end where it says......
“Therefore, it must be asserted that the angels are instructed through the church, that is, through the apostolic preaching… in such a way that they are not taught by the apostles, but in them…”
Take off the prot blinders and read in context, don’t cherry pick verses as all prots have been programmed to.