This really does have 16gb of RAM, right? One place in the description implies that it has 8 and is expandable.

I did check again on computer properties, and yes it does have 16GB RAM I bought 2 of them, and they both do have 16 GB , as described on the title.

Does this machine have Wifi built in or do I need a separate device?

Hello, Thank you for contacting us in regards to your question. This laptop will have WiFi built in. Thank you and have a nice day! Newegg Support

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Lenovo Thinkpad T430 - i7-3520M 2.9GHz - 16GB Memory - 256 GB SSD - 14" HD Windows 10 Pro 64 - 1 YEAR WARRANTY