I was very confused by the date format, so here's the timeline with ISO dates:
Vulnerability found, 2022-11-08
Sent detailed PoC, 2022-11-09
RIGOL says they would have contacted me with updates from R&D, 2022-11-09
Follow-up on the vulnerability, 2023-01-25
RIGOL says they would reply in 2-3 days, 2023-01-28
Full disclosure, 2023-02-08