Demo storytelling, handling a live failure, and defining POC success criteria that convert.
3 questions in Presales & Solutioning.
Say it does not, then find out what the requirement behind the question is, because what decides the deal is whether the gap blocks them and what the honest path around it costs. A soft yes turns into a contractual obligation that somebody else has to deliver.
Scope a POC around the two or three technical claims genuinely in doubt, with written pass/fail exit criteria signed off by the person who will decide, a hard time box, and named customer resources committed before any work starts.
A POC removes a technical objection; it does not create a buyer or a business case. Deals lost after a passing POC are usually lost on the commercial track that stood still while the technical one ran, or on criteria measuring what you are good at rather than what the buyer had to decide.