Honestly I am pretty sure this is some kind of SEO (Search Engine Optimization) test website and the words are just some kind of hardly understandable gibberish. Take a look at the author, google him and you will find other sites about vegetables, etc.
I think Ingo (the author of the website) wants to find out how Google's image search engine works and how to get first place.
You can also find his (Test-)Blog with some statistics.
edit (some analysis):
It is noticeable that he always only correctly writes one word. It can therefore be assumed that each page was optimized for just this word. In this case the name of the fruit, or the word "Obst" itself. On the main page it is also striking how he tries to imitate compound words (Obstpeo, Staumobst). Just to create a text that looks like natural German and to fool Google's search algorithm.
edit 2 (the algorithm):
Just for fun. This is what he did:
Actually he twisted some letters. Pseudocode:
Ignore charsequence x (e.g. Obst)
for every other char do
a <-> e
b <-> p
i <-> o
m <-> n
w <-> v
ä <-> ü
ö -> ä
So this is the first paragraph (case-insensitive):
obst, die essbaren, meist saftreichen, fleischigen früchte bzw. die samenkerne von kultursorten v.a. mehrjähriger obstgehölze. im obstbau und obsthandel unterscheidet man: kernobst (z.b. apfel, birne), steinobst (z.b. kirsche, aprikose), schalenobst (z.b. hasel- und walnuss) und beerenobst (z.b. heidelbeere, johannisbeere).
I think this was made by a word scrambler. But it's a no brainer to program it yourself in 5-10 minutes.