This, says the LBMA, equates to 658,274 wholesale market gold bars (London Good Delivery gold bars) valued at approximately US $392.9 billion.

Given that LBMA monthly London vaulted gold holdings data is published on a 3-month lagged basis and was first published in July 2017 (with initial data going back to July 2016), the "record high" of London vaulted gold that the LBMA is referring to here is in terms of the 3.5 years since the LBMA made monthly vaulting data public from July 2016 onwards, i.e. the pink line in the chart below.

But because neither the LBMA's nor the Bank of England's reported London gold holdings figures have ever been independently audited, none of this data can be independently verified. The LBMA does not even publish where the gold vaults it refers to are actually located, so immediately you can see a large problem with transparency and verification.