Hutton was the first to posit an age in the billion year range. Kelvin and other posited ages well beyond the 7000 year mark and in contradiction to the 6-day account of Genesis well before that.
The premise of the article is that YEC doctrine is an all or nothing proposition. If you depart from it at all, you depart from Christianity completely. The blasphemy did not originate with Hutton.
The topic and this discussion pertains to the words actually written in the Bible, their import throughout that Bible (not just in Genesis), and the faith in God that is demonstrated by taking His Word at face value, as Jesus, Moses, Peter and others quite clearly did, and the pitfalls of accomodating the Word of God to the words of man.
The only label of interest here is Christian, or not. If you want to go on about Yeckers and Oeccers and Geocentrists, Oh My! then that is your particular fixation. It's also your prerogative. But, beg your pardon if the boxes you want to put us in to study us, are not of primary concern.
Hutton's geological ages provided the foundation of modern evolution as far as linear time. It has been built upon and expanded, and continues to be built upon and expanded, now into the trillions of years. Kelvin had and has no such notoriety in this particular regard. Hutton does.