Well, I am glad you came back to Elite. I had wrongly assumed that you were aware of the changes made to the game. Much to learn! Here is a sample of things you may, or may not be aware of:
100 mil an hour (not including selling times and bulk Sale Taxes, mentioned above) is still quite possible. The Hazardous Resource Extraction site 'buffs' to laser yields are one way to achieve this. Another is 'Mapped Mining'.
Metallic rings are the only place to 'laser mine' Platinum.
Metal Rich rings (what you were probably in) do have Platinum Hot Spots. But only Platinum Core Deposits are available to take Platinum from. Not laser mining.
Void Opals are only found in Core Deposits, but in Icy Rings, not Metallic, Metal Rich, or Rocky.
I suggest, if you wish to continue your search for knowledge on this topic, [or fact-check any statements made here] that you install a program called Discord. The Elite community using the app will help you find up-to-date info on it.
Also,
The comments section of the old videos you watched will likely have newer info about this as well. Just look for relevant comments that are less than 1 year old.
This is the link for another source of info that is more current, and helps debunk statements such as "Misnamed Void Opal Hotspot", or "Cant find Platinum to lase"
https://www.reddit.com/r/EliteMiners
You certainly are not the first CMDR to experience confusion over the changes FDEV have implemented, and perhaps these sources of info will help you to understand why the changes were made, get over your frustrations, and get back in the saddle!
There is also new mining equipment for your Python to try out! Multi-Limpet Controllers. (Collect and prospect with one device)
Again, welcome back to Elite, and I wish you well on your adventures! Friend request me, if you like (and are on PC) and we can wing up sometime!
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Oo
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Spike.k