I’m no expert, but I don’t believe that “high-assay low-enriched uranium” is the sort you can use in nuclear weapons, per it being “low-enriched”. According to the DOE, HALEU only goes up to 20% enrichment [0]. Nuclear weapons, it seems, need it to be enriched beyond 20% [1]

[0] https://www.energy.gov/ne/articles/what-high-assay-low-enric... [1] https://en.wikipedia.org/wiki/Enriched_uranium