Earlier quoted context omitted.
I am very uneducated on this subject, what exactly is the problem with that sentence?
Apparently the code is Apache licensed, so you can use that code. Putting a file somewhere that states "you agree to X by using the software" without you signing anything isn't an enforceable contract. If they want you to agree to something it needs to be (e-)signed. Not just stating an action and claiming that by doing that you agree to a contract.
They can't bind you for doing nothing (opening a package for example).
They can bind you if you get the benefit of the bargain, which you would by using the software.