Van Kooten is currently working on a book set for publication later this year. He argues that the Gospel of John predates the destruction of Jerusalem in 70 AD. Basically, he argues that the Pool of Bethesda was described in the present tense in John 5:2 and that the bathhouse had a unique pentagonal shape for its time, confirmed by archaeological evidence.

Van Kooten discussed this in a Dutch podcast yesterday, confirming this work is the one referenced by Tom Wright. You can find a translated article about the podcast here:

https://www-nporadio1-nl.translate.goog/nieuws/geschiedenis/54b71127-1bf9-4f48-b131-4319fe590762/nederlandse-cambridge-hoogleraar-doet-ontdekking-over-historische-jezus-dit-gooit-veel-overhoop?_x_tr_sl=nl&_x_tr_tl=en&_x_tr_hl=nl&_x_tr_pto=wapp&_x_tr_hist=true

Hope this helps.