When did VK Singh say India patrolled past f4? Since you are quoting him, show me when he said exactly that.If one reads Colonel Dinny's comments on Ladakh crisis, all the material he says is BJP narrative. Now why is he trusted source on details like whether IA patrolled past LAC more than PLA if PLA even has. He's also retired.
Colonel Dinny is much, MUCH lower ranked than General VK Singh. Colonel Dinny is much longer retired than General VK Singh has been at a different Indian government post. General VK Singh is a four star General and on record saying IA intruded past LAC (somewhere between F4 and F8) more than 5 times more often than PLA.
Both of these guys are going to be more pro India and say things that make India look better. What they do say already at the VERY LEAST hint at what actually is because they are in the Indian camp and both are politically 100% pro India and will not talk for China. Whatever VK Singh says that "helps" China's cause and narrative is because the TRUTH is WAY more in favour of China in that case.
Dinny's said so much nonsense and politically biased stuff that he's statement on IA "rarely" patrolling past F3, a politically sensitive cop out statement.
VK Singh admits IA intrude much more than PLA and it's likely PLA doesn't even really bother patrolling F4 to F8 if the 5:1 ratio is taken.
And he is right. Both sides do regularly violate the lac, at areas where htey hold tactical advantages.