They are using magged reels and are reducing the braking by winding the mags off during the cast .
Absolute control over (multiplier) reel spool speed is the key requirement for distance on the field. The most consistent method to achieve this, is by “magnetic control” of spool reaction (surge) in the initial stage, and adjusting the magnetic influence over line flow in the middle and and final stages of the cast.
A caster capable of emptying a spool will find the spool accelerating near the final stages, and with line feeding from an ever decreasing diameter, it will hold the cast back unless it is extremely free running. Backing off the "mags" all the way allows this. Centrifugal brakes come on hard at the end of a cast and can’t be adjusted mid flight, which is why adjustable “mags” are preferred.
Centrifugal brakes are good enough for fishing though, as this refined level of tuning is rarely needed on the beach.