No, it's not obvious, because the article doesn't deny any dogmas. It's merely uses terminology employed in other places in the days when this wasn't an issue.
I did not say the article itself denied the dogma. I said the title did. If you cannot admit that the title is heretical then I don't have anything to say to you because we cannot understand each other. It is like I am looking at an apple and you say "no, it is an orange".
What I said was the terminology wasn't overtly heretical because it was used by some theologians to speak of those who were not actual members of the Church. In other words, outside the membership of the Church. Catechumens are by definition not members, yet they are not necessarily considered outside the Church.
I wish they had titled it "An Explanation of the Dogma, "Outside the Church, No Salvation." If they had done this, there would be no scandal, and there would be in need for this conversation.
Msgr. Fenton wrote to correct some theologians who were using imprecise terminology. In my opinion, this imprecision led to what is commonly called, "Feeneyism." What we have now are new ideas that even Fr. Feeney would be shocked about.
All of this could have been avoided if Catholics faithfully learned from and obeyed Pope Pius XII.