I am not sure what to think about that video. Their main point seems to say that if a manufacturer outsources any part of the supply of components for their tractor; that is a generally bad thing. You supposedly won't be able to find parts in the future.
First off; every manufacturer outsources some or all of their parts from outside sources, regardless of the color or brand of the tractor. Like it or not, that is how the tractor business works and will likely not change. It would make little business sense to make every component. Take alternators for example. If Mahindra made their own, it would probably be of lesser quality than an outsourced major alternator supplier. Making your own doesn't guarantee better quality or availability.
Secondly, it is extremely difficult for the average guy to find out the source of components of any tractor of any brand. Possibly the dealers or representatives will mislead you or flat out lie. But more likely, it is because the supply chain is so convoluted and constantly changing between different models of the same brand that they couldn't possibly keep up to date on it.
Thirdly, I do indeed think their are some tractors that are better than others, and parts are easier to find. I think those items go hand in hand. But the availability of parts is far more dependent on the number of units sold than weather or not components on the tractor are outsourced.
In the end, I think this is a good video to ignore.