This is what the link says:
Ladder Safety Devices have carried out extensive tests of their new stabilising system using the test procedures recommended by Loughborough University and the results establish that it does indeed prevent failure in all four modes on ladders up to 7.5 metres in length and thus meets HSE requirements as a valid means of compliance.
The System consists of three parts. All parts use clamps for rapid and secure attachment. No drilling is required.
Stabiliser arms hinge out and are locked into position with a telescopic strut with adjustment at 12mm intervals. The free-running wheels clamped to the top of the styles and the ladder leveller at the bottom have soft sticky rubber tyres and feet which provide enormous resistance to slip
But the work at height regulations require duty holders to:
avoid work at height where they can
I'm not 'knocking' ladders, but Scrimcity's (the link) is talking rubbish.
Just purchasing this item does not mean you're in compliance with the regulation. However, once other methods, such as WFP have been ruled out as being impractical, then this device may satisfy section 6, which goes on to say how ladders should be used (ie tied off, or using ladder stabilisation devices, etc) when working at height can't be avoided.
The item also looks to be big and bulky and not practical for routine window cleaning.