Can't see the actual code in tutorials

I am currently reading this tutorial: link
There are parts like this, where there should be code, but there isn’t.

Could you help me, why can’t I see the codes in this tutorial?

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I still do not have solution for this

Did you file bug report? Bug reports help us fix the bugs.

I am pretty sure if this bug involved more than one tutorial, it would be known to you, isn’t it?
I assume that at the time of the publication of the tutorial, the code in the tutorial was visible. But somehow it disappeared. I can’t either see it in the web page source.
Maybe if you have these tutorial on the server in plain text, could you send it to me?
I need it for an assignment at my UNI.
Thank you

The tutorial is three years old, so many things could be wrong. I don’t know where the source for the article is.