Hello, I can confirm that the above is still of interest today (2025-03-21) on master (efac1498c15198afc4f9a2bc700408bde1b3b3ed). I can build on my machine, although I get the message:
error: Problems running gs. Check your installation! and, if I pass the --no-grafts --check options: guix build: error: derivation `/gnu/store/q0klgx1zgwkck2dkiz619sj059bmq98w-hypre-2.20.0.drv' may not be deterministic: output `/gnu/store/21zjskysh9az39nby24jr8ps46zsm4wq-hypre-2.20.0-doc' differs