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First of all, to get to my desired slope, you totally can just glide from the rooftop, but i think thats a tad boring so i was looking for a more challenging way!
Luck's with me, as the slope is connected to the main skybridge with some small rods... standing on most will result in you sliding off because of the slipperiness volume of the slope itself, but there are 3 rods that i could consistently remain on! Two are very close to eachother making for an easy target to drop down onto, and another to get just low enough to be able to get onto the slope
As with most slopes, you cannot just go and grab it. So instead, im using a Slingshot glitch's hidden mechanic: it allows you to sometimes grab edges of normally ungrabbable slopes!
One way to do it is to run on a normal surface, quickturn and IMMEDIATELLY jump, then quickturn again once midair. This will result in doing a 360 noscope and if you land on a slope in this state, you can do a slingshot glitch while moving forward, but also in rare cases if you get close to the slopes edge in this state, theres a chance you will grab the edge! I'm not sure why its not 100% consistent...
But in this case, we dont have a place to stand on before landing on the slope, so another way to do that is to jump off a slope so you land very close to its edge, and then when youre just about to hit the floor, quickturn and move forward! Again, not 100% consistent, but its fun to do imo
Chaining those moves allowed me to slowly make my way down the slope without uncontrollably falling (after several tries). Its useless but eeeeeeh