His blog was not updated since December 22, 2017. There is no contact option on his site.
He was selling his whole Marklin H0 collection in June 2018 on a Dutch train forum because he was quitting the hobby due to health issues.
Sn00zerman-29-06-2018: het einde van een hobby, het einde van een droom ... (scroll down to post from June 29 2018 and let google translate help you
). It is linked to a "For Sale" section on his website (currently not public).
On youtube he had not posted new content since 3 years but he replied just two weeks ago on a comment on a video he once posted:
So, he is still around somewhere, at least 2 weeks ago he was. ;-)
Perhaps you can contact him through Youtube.