Interesting, where did you read this?
This in Autosport article,
"The resultant rise in engine revs after Verstappen went over a kerb activated a Honda protection mode and an FIA system that Autosport understands relates to how the governing body ensures driver aids are not being used.
Versappen's power cut in no way implies that Red Bull or Honda are employing a traction control-style system, but a protection mode that reduces torque when a driver suffers too much wheelspin would partially replicate the phenomenon.
Honda's system caused the initial loss of power as it cut in to avoid excessive revving damaging the engine, triggering a torque reduction when Verstappen was at full throttle.
After this, the FIA system - which is the same for all teams - filtered the engine back to full power.
Traction control has been banned in F1 since 2008.
F1's technical regulations state that no car may be equipped with a system or device that is capable of preventing the wheels from spinning under power, or of compensating for excessive torque demand by the driver."