Dual booting high Sierra and Ventura mid 2011 iMac 21,5 inch

Hi guys!
I'm planning to upgrade my mid 2011 21,5 iMac to Ventura with OCLP, after receiving my Nvidia k2100m and BCM94360CD. ( 16gb, 1tb ssd, 1tb hdd)

I'm currently on the latest version of High Sierra, and I would like to keep this os and install Ventura on a second partition on the same ssd. After doing some research I found out in the macrumors iMac 2011 gpu upgrade forum, that dual booting with high Sierra causes issues, quote:

''About double booting with High Sierra:
High Sierra uses APFS but starting it up will corrupt the preboot partition in a way it badly interferes with Big Sur and later. If you need a double boot consider using Sierra instead on HFS+ in a separate partition!'' 2011 iMac Graphics Card Upgrade macrumors (--> spoiler 5 --> installing macos high sierra)
Since I couldn't find anything about this in the olcp documentation, I thought I may ask over here.
- Is this problem still persistent today, or patched with newer olcp releases?
- Would this also be a problem if I boot high Sierra without opencore (native)?
- Are there any other things I should consider?

Thank you in advance!