Hey there! I'm the PM for Stripe Tax, I'd love to hear more about your use case around how frequently you'd want us to be revalidating VAT IDs, the information you'd want returned, and of course any other tax-related requests you may have: [email protected]
Stripe's VIES validation only takes place once and there is no way to retrigger it.
For compliance purposes you have to validate it yourself every quarter or so, on recurring transactions.