Is this tutorial out of date?

Im trying to learn how to use Timers in C++ with this documentation:
https://docs.unrealengine.com/en-US/Programming/Tutorials/VariablesTimersEvents/1
Is it out of date? I’m getting a myriad of errors such as:

paste the output log and your code, remember to use code formatting

you use UTextRenderComponent but don’t declare in head file, I suggest that put #include “Engine.h” into the file “Countdown.h”,then complie it again.

I figured it out by reading new documentation. I was just wondering if this particular document is out of date. Following it exactly has resulted these errors. The solutions that I’ve found are not reflected in the link I provided. Also, I ended up posting this twice and will be closing this question (if i can)

you can close it