Because most of the USAF's F-16s aren't plumbed to use CFTs.
From the article:
Over 250 of these aircraft are Block 50/52 F-16CJs that were delivered optimized for CFTs. In other words, around 30 percent of the USAF most advanced and youngest F-16s could easily be fitted with CFTs,
The question pertained to the Newest USAF F-16's not to the most of the USAF's F-16's.
From the article.
"Over 250 of these aircraft are Block 50/52 F-16CJs that were delivered optimized for CFTs. In other words, around 30 percent of the USAF most advanced and youngest F-16s could easily be fitted with CFTs"
Seems fitting the 250+ with CFT's would be smart.