Try saying "Remind me in two weeks to eat a banana" to Siri. It seems to create a reminder for today at the current time. Can someone confirm this? Siri no longer seems to understand weeks. What are those 100,000 Apple employees doing??
In theory that is true and applies to many things that are related to Siri, but plenty of people have certainly had different experiences where something doesn't work at all or correctly for some while it works fine for others.
Siri does understand weeks - just not for the Reminders app. Ask "What is the date two weeks from Friday?" and she gives the correct answer: "Friday, November 18, 2016."