What a load of BS.
You can do the tests yourself. G43 PFussiliers do an excellent job vs pre-Bren Sections when fighting Green Cover to Green Cover at variable ranges whereas Volks just eat shit with or without STG's, and you have the bonus of being able to close in with 90% moving accuracy to put the Brit on their back foot even easier to really get the highest damage scaling which will absolutely destroy whatever unit is infront of it. Once the Brit player upgrades Brens you no longer win the cover to cover fights (you put up a decent showing though and can hold at the very least), but you still have the ability to close in with the previously mentioned moving accuracy and the Bren's bonus damage over Enfields becomes nearly irrelevant due to reverse damage scaling resulting in the same obliteration as pre-Bren.
Now, that's in a vacuum. In practical situations the ability to close in on Sections with Pfussiliers is not likely going to be as easy since PFussiliers are a bleed machine with a giant target painted on them wherever they are foprcing focus firing, and unless your opponent misplays early you're not going to have more than 1 or 2 upgraded and vetted late since you just lose the early game with their poor pre G43 performance. So yes while they do have the capability to destroy Sections when used correctly, they have their own flaws that can be capitalized on by a good player.