I'm warned not to rehash.
So, just reminders: Dynaglide is explicitly a throw rope for arborists, used to haul up other ropes, saws, blocks and tackle. NERopes would not / did not respond to me about its tests for it. The only other throw rope with this high reported breaking strength seems, by description, as though it could be from the same maker. It is called Stein Safety throw line, sold in British Commonwealth countries. IIRC, NERopes is a division of a European-owned cordage maker. Maybe they are the same cord with different badges.
The issue with weight per length of Dynaglide could have been due to the same problem I addressed a post or two back, rounding error and resolution. From early posts in the thread, you'll see those issues were insufficient to explain the misreport of Dynaglide weight. As happens in catalogs -- and I've been through lots of lots of them -- there are occasional printing errors. I look forward to congratulating the HF member who discovers the hi-tek cord which has been neglected by everyone because its weight was printed in catalogs as 35-50% greater than it really is.
I'm happy you mentioned the Cordage Institute and its standards.