“The key word here is ‘reformed.’”
I hold to a YEC viewpoint mainly because anything else just doesn’t fit theologically (literalness of Adam & Eve, original sin, etc.), so I don’t agree with these authors.
However, the term “reformed” is often a code word for “calvinism” and not liberalism. Henry Morris and his cowriter (a Prebsyterian - thus Calvinist minstry) wrote the definitive first YEC book, “The Genesis Flood.” Most “reformed” Christians I know hold to a YEC or at least a literal creation view. Whatever, I’m not sure that “reformed” means what you think. Blessings on you.
I’m familiar with the affiliations of Morris, Kennedy, etc. but the upper leadership of the Reformed denominations definately does not share their views.