They've clarified, they don't mean surge pricing and charging more during busy times.
https://qz.com/wendys-surge-pricing-burgers-uber-dynamic-pricing-1851292583
“Dynamic pricing” is widely understood to mean changing prices as demand fluctuates to maximize revenue. But after
an initial backlash from customers, Wendy’s says Tanner didn’t mean “surge pricing” when he said “dynamic pricing.” The company spokesperson told NBC there are “no plans” to raise prices at high-demand times.
“We said these [digital] menu boards would give us more flexibility to change the display of featured items. This was misconstrued in some media reports as an intent to raise prices when demand is highest at our restaurants,” the Wendy’s spokesperson said. “We have no plans to do that and would not raise prices when our customers are visiting us most.”
“Any features we may test in the future would be designed to benefit our customers and restaurant crew members,” the spokesperson sadded. “Digital menu boards could allow us to change the menu offerings at different times of day and offer discounts and value offers to our customers more easily, particularly in the slower times of day.”