to process Level 2A producs from L1C products, band 10 is used, but not converted to bottom of atmosphere reflectance: Bands 1, 8, 9, and 10 missed from sen2cor processing and here Why are some bands not computed after Sen2Cor processing?
VHI is not possible with Sentinel-2, because it is based on VCI (requires NDVI) and TCI (requires surface temperature). Sentinel-2 has no temperature band.
source: https://www.mdpi.com/2072-4292/10/9/1324