I would be concerned about the metal that the pot was made from.
The acid in the salsa can eat away at the metal and leach it out into the salsa.
Even if you were going to put it in jars there is no reason to boil it first the pressure cooker will kill anything.
If there is enough acid in the salsa you would just need to hot water bath it anyway.
I have seen the big salsa producers go from a boiling pot to sterilized jars with no hot water bath.
6 to 8 weeks is a long time for something to sit without preserving in my opinion.
I got food poisoning in Italy and let me tell you it is no holiday.
My body reacted violently for about 3 days, I thought I was going to die.
Worth