I'm not entirely certain what you are getting at. I think you are getting thrown off by the difference between flower and oil, as oil is a byproduct of extraction. Also, ignore what comes from an LP, that is immaterial. They are allowed to sell based on a prescription from a doctor, so if a doctor prescribes 80 GRAMS/day, that's what you can buy (assuming you can afford it). Likely you can't, so the common next step is to apply for a personal grow license from HC based on your prescription. It is not a difficult process either.
https://www.canada.ca/en/health-cana...-purposes.html
Typical prescriptions are around 1-3g/day of flower. That is a TYPICAL prescription for things like insomnia, migraines, etc. These are not typical. Cancer patients on Phoenix Tears use around 1000mg/day of oil made up of 70%THC, 10% CBD and 5% CBN (the rest is alcohol) which would require (roughly) 1/2lb (224 grams) of flower to make. Their dosage is high to ingest as much CBN (not CBD) as possible, which only occurs in very small amounts (5% by volume in most strains).
I have seen prescriptions as high as 120 GRAMS/day from a doctor, with an accompanying grow license of well over 400 plants for PERSONAL use. I have never seen an actual grow that size but the licenses YES. I actually just looked at one.
I am also not confusing grams and milligrams. I am quite familiar with the difference, the conversion and the doses.
These exist. It's likely a loophole in Health Canada, it will likely get closed, but they are out there.