Yes it has the same 15 bar pump as most home machines - even ones that cost up to $3K. Those expensive ones use a mechanical valve called an OPV to bleed excess water pressure back into the water reservoir. Cheaper machines like your 800 use very thin pipes to restrict the flow in an attempt to regulate pressure less expensively.
To answer your questions:
- Yes 9 bar is the ideal, but your machine will still make decent espresso with a good grinder and non-pressureized baskets. The baskets that come with your machine have lots of holes at the top and one little hole at the bottom. This forces coffee through that little hole to churn it and make a foam on top of the espresso that looks like crema. This makes stale coffee look fresh - but will still taste stale.
- Yes still aim for 60ml in around 25-30 seconds, but fine tune by whatever you like the taste of the most.