The article is just one man’s opinion. It is not any kind of official dogma of the Church.
It is a legitimate opinion and I respect it, but I disagree.
I don’t have time to delve into the answer to the question right now, but I will say this: there is more to hymnody than taking us to the threshhold of heaven and letting us participate in the worship of heaven itself. There are hymns that teach, hymns that comfort, hymns that energize.
Above all else, hymns are communal. I can go home and sing a hymn, but the purpose of a hymn is corporate worship–worship that I do with other people. I think that we cannot leave out this corporate aspect of making music in the Mass. The Mass IS a gathering of God’s people around the Table of Sacrifice. It is not a private devotion time.
Frankly, I think we are full of ego if we think ANY of our silly human hymns, including Gregorian chant, come anywhere near to the music of heaven.
But that’s OK. To God, a mom singing a lullaby about Jesus to her child is worshipping Him, and the worship is no less than a choir singing a magnificent oratorio.