I think you are in error there. Vantage Drilling Company does have 650k shares of VDI if you peruse the actual SEC filing and I think even in a sticky here you will see that the 650k are listed. and that is post nov 2018 link you supplied.
However, since VTGDF doesn't file anything and doesnt even seem to be anything more than a liquidation file we actually do not know 100% if the Vantage drilling Company listed in the VTGGF filings are one in the same. I think they are but then the pps of VTGDF makes no sense then.
The only true way to figure this out is if KPMG actually published in some way the details of the file such as the balance sheet and any dusbursements or bills incurred since 2016 when VTGDF went dark