Per the link : "http://www.sqlshack.com/the-dbas-guide-to-stretch-database/"
Below are the data types which are not supported:
CLR user-defined types (UDTs)
-- Considering this I was thinking why not "dateoffset", in place of text/image?
Apparently, the list in the article is not correct.
Unfortunately, factual errors are quite common in IT related publications.
I even once won a bet that I'll find a false statement in any of books published by MS.
So, - do not trust strangers from Internet!
Even when they carry some heavy medals of honour.