Then the website is wrong. I've been at a senior level in motors for 30 years and both brushed and brushless motors will react to the load demanded of them.
Brushless means there are no carbon brushes required to contact the stator winding. This results in a better power delivery and negates the need to replace the brushes periodically. This also generates less heat and the motor may be controlled more effectively with electronics. Toolstation offer these previous models which are perfectly adequate for most tasks but if you are a regular user then brushless is the way to go.
It was copied and pasted from a website (y)
Not correct. Motors are inherently stupid machines that will attempt to deliver whatever power is requested of them. That's fine until that power is beyond their thermal capability or the torque demand is beyond what they are capable of delivering, either of which will result in excessive temperature and a burnout situation.
"Brushless motors mean: better efficiency, a motor that lasts 10 X longer, 25% more power, and 50% longer run time!" According to the Milwaukee website. I have the Fuel impact driver and drill set with 4Ah batteries and it's a very nice set. Batteries last ages.