Are BD-R LTH discs (Verbatim made if it matters) still not suggested for archival of important data?
Avoid them at any cost.
Not just Verbatim LTH media, but LTH media in general should be avoided.
For archival of important data you should use Panasonic BD-R media.
I looked where I usually buy discs from and they only had BD-R LTH media in spindles. At three times the price they also had BD-R HTL media in jewel boxes of 10. If I had a bluray writer I would be tempted to try the cheap BD-R LTH media.