I'm not sure, but my recollection of the article in question is quite specific - that when there was a delay between exposures across strains, the hemorrhagic fever did not result.

This article (The Autoimmune Mechanism in Dengue Hemorrhagic Fever) https://pubmed.ncbi.nlm.nih.gov/29686179/ is probably more relevant.

Why cross-strain exposure would prevent that auto-immune reaction, I have no idea - probably something to do with tiny little puzzle pieces that almost fit.

(And no real need for the condescension.)