What are the capabilities of modern chinese VLS?
Too broad of a question. Be more specific.
Are they currently being quadpacked. Reports of the HT-1E VLS for export mentioned that capability specifically.
Question is asked in the wrong way.
If you want to know whether a quad packed weapons system exists for the PLAN, yes we know of at least one type with confidence for the UVLS -- there is a quad packable MR SAM whose designation we do not know but is sometimes referred to as the 3x5 SAM in relation to its supposed performance.
By now it should be in the last stages of development and testing if not service, but how widely proliferated it is and to what scale the PLAN will procure it eventually, we do not know.
We also do not know if other quad packed or multi packed weapons are in development or not (for either UVLS or H/AJK-16 VLS).