What actually speeds up a closing is removing uncertainty, and an as-is condition helps with that by telling buyers upfront not to expect repair negotiations after a $400 to $600 home inspection turns something up. It does not remove the buyer's right to inspect or to walk away on a condition.
Pricing has to reflect the condition honestly for the speed benefit to show up. An as-is home priced as though it were fully updated will sit and eventually need a price correction, while one priced for its real condition from day one tends to draw offers within the usual first week or two of exposure.
The disclosure and the price are what move an as-is sale, not the label itself. Get your hand-reviewed valuation from Joel Dyck.