I'm looking at Toyota's website about the Sequoia SR5
here, under the Safety tab, and it does indicate the anti-theft and immobilizer as standard equipment. Typically, the anti-theft is an alarm, which should have the keyless entry included. Make sure you are getting the right information and equipment for what you are paying. Some dealers can purposely delete the standard equipment and offer you as an option for you to buy. Hopefully, that's not the case, otherwise, you need to report them to headquarters and the BBB.