^^^
Ummmm, yes!
They hope everyone thinks this way and soon you will have no consumer rights, that took so long to get.
Besides, such violations are blatant if it's a legitimate business. You don't go after them on your own coin.

You think the public would stand for this if say Honda claimed you void any warranty if you don't use their oil filter and lubricants? Of course not, such tactics have been tried and failed.

Next round of warranty saga, is the development of 'smart bolts' in Europe. These will have data recorders embedded that would reveal if a fastener had been removed or loosen by anyone other than factory/dealer personnel. Thus, they void your warranty for messing around with a part.
There's a dark side to every industry.

As for grease, it depends on your needs. No one single grease is best for everyone.
If drag is an issue, run on a thick oil and re-lube after each ride. Or a thin white lithium or moly grease.
Personally, viscous drag is over-rated in grease performance. It's irrelevant to most riders. What little added drag is overcome by the inertia of bike/rider. Protection and long-term lubricity is what's important to me. Silicone greases (Marine, Phil) offer superior waterproofing, won't run/bleed, very sticky. I find it great for hubs, BB, headsets that don't have good sealing. If you don't submerge the parts in water (and that water will infiltrate everything) it'll last a long time and cut down on maintenance for those who don't enjoy wrenching.
I also like the extreme pressure characteristics of moly greases. Barring contamination, it should protect the races, cups and cones best and make them last a lifetime.
But just about any off-the-shelf grease will easily serve the needs of a bike.
I like to overhaul bearings based on mileage, not a time schedule.