sleirs method is out now, you can grab the 4.03 site at his newest repo ps4jb2 (the 4.03 folder has the site)
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as for the payload.bin to dump a mounted game (eboot.bin+modules) you can find it on this link:
sendspace.com/file/d93z2j
the site is this one, for 4.03 people to easily access:
sleirsgoevy.github.io/ps4jb2/ps5-403
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usage is the same as always. start the game, minimize the game, go to browser, launch exploit, then load payload.bin. should dump to usb iirc
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