This very easily comes down to access as well, and how well organized the marketing teams are at these brands. And you can tell how well organized Sazgar's director of marketing is when he's in the videos. And not only is he knowledgable about it, he personally takes time to participate and promote his products.
This is a very forward thinking approach which the majority of our "seith" culture owned businesses lack, and this makes a significant impact in terms of media coverage. I've seen that guy in videos of other car related channels from Pakistan as well so it seems like he takes his time to promote his products across the board.
I'm more in tune with the tech industry so I can only give analogies from there but think of someone like MKBHD and how he covers certain brands simply because they provide him access and make his job easy. Or someone like Dr. Ian Cutress from the hardware side, or Richard Leadbetter (Digital Foundry) from the games industry.
I've been part of this cycle in the past and press tours like these are a major part of marketing. In our industry, it seems like only Sazgar is taking advantage of the modern day press tours by promoting their products on these digital platforms.
My only problem here is that these videos should (1) not be promoted as we "Reviews" and (2) should have full disclosures that these are because of special exclusive access
This can very well just be scheduling related. He said in a new weekly video that he was in Karachi for a couple of days for some events and it could just be that's when Changan / Deepal sent over the cars to promote them.
Manufacturers often send their products well in advance to reviewers. Back in the day, I've had devices under embargo 2-3 months before they were ever publicly announced worldwide to play with, and more importantly, give feedback before public launches.