What do these sentences mean?

I have a few questions about the sentences in the reply to Augustus firt mail to Van Houten.

these sentences are:

• Geography can be said to exist in our triumphantly digitised contemporaneity.

• The entertainment bacchanalia

• What do you mean by meant?

• Angst-encumbered sixteen-year-olds

And then 2 other questions:

• Why does he choose to write in this style?(the difficult strange style)

• This style is a very descriptive style with many old words, he doesn't want to

use modern words or the internet. Why?