130 for the rotor is not too bad.
980 for the wheel is not great. I’d expect to get to about 750 front 850 rear without going mental, but it is still gonna set you back £500. I’d go with DT Swiss 240s hubs plus rims and spokes of your choosing from ActionSports.de
Shinamo XT cassette from Germany for a good priced, light cassette.
Tubeless is also a good place to look to for weight loss and a better feeling roll.
Tyres are easy to find crazy light ones, but make sure they are going to do the job you want them to, and be robust enough. No point having a super light tyre if it gets a 3″ gash in it 20 miles from home.
Unfortunately, a lot of the weight loss on a bike is from a little bit here, a little bit there. Which means ending up with a different bike to what you started with, unless you are buying the whole lot from new.