The C32 was delivered by HAL a long time ago; I'm not sure if we have used it in the lunch vehicle or not.
No, they have not used C32 anywhere yet. They have only used C25 in all their announcements. Nor they have launched anything > 4 tonnes to GTO in all the five launches to make you believe so.
First launch was suborbital
Second and third launches were less than 3.5 tonnes GSAT-19E & 29 when C32 had neither arrived, nor was needed.
Fourth was 3.8 tonnes Chandryaan-2 to EPO (which was only sent to a perigee of 45000 kilometers, confirms there was no C32).
Fifth and upcoming 6th are just LEO missions.
So we can be sure that no C32 was used.
The main test is the SCE 200 engine; once we complete it, we will complete all stages of current-generation engine development.
Qualification tests have been finished and test stand is there.
Four SCE-200 will now be produced in first batch, 3 will undergo ground tests and fourth will have actual fight, some time in 2026.
Next, we should work on clustering
No, we don't have facility to test clustered SCE-200. New one at IPRC can only test SC120 and not 160, 200 or 400.
India won't have an HLV & SHLV before 2030 even if it works at war level now.
autonomous landing; the Methalox engine can be developed in parallel; we have plenty of time.
Methalox engine has been in development by LPSC for much longer, have tested many small and medium prototypes.
They have been built and tested a new one called LM20 recently for 20 tonnes class.
RLV is a long term demonstration program for all future RLV. So even if autonomous landing takes place in 2025, an operational landing of an Indian RLV won't take place before 2035.