Please have a look at the Green highlighted text (yellow means normal highlighting, green means; requiring attention with specific reference & contrary to our country, red means; alert!)
Can you believe it to happen here? Do you think IMC Toyota will accept claim and warranty, if you perform maintenance from any garage / workshop / service provider, other than Toyota? (provided, and the condition is; the garage is reputed and does the work in the same way as Toyota does)
What I have concluded is; you are not 100% bound to have anything / everything always done from Toyota (although they do recommend Toyota dealerships, and its OK). If some other service provider does the work in the same way as Toyota USA does, then Toyota USA is OK with it. And... It only happens in USA and other similar countries, where a human being is treated like a human being, is given respect, and is not exploited!
(If I am not wrong, then I have learned that even if you buy and change engine oil, oil filter, and even air filter from any garage other than Toyota 3S dealership, the warranty is voided! Even if everything is 100% genuine, original and as per OEM recommendations.)