We're not running out of food, but the there's a huge price we're paying for that: We're destroying nature and ecosystems. Don't ever think this comes for free.
We need renewable farming as well as renewable energy, and I don’t see any guarantee that such a thing can support a world of 8+ billion people.
All of the things you listed can be made renewable on timescales exceeding the natural lifetime of the sun with only engineering (rather than scientific) breakthroughs, including making the sun last longer and moving the earth to a different orbit to suit the light of the engineered sun.
No, Malthus gets the last laugh because the sub-population that reproduces most, regardless of whether that is caused by genes or memes, quickly dominates the overall population; this means that even despite the currently sub-replacement birth rate, it's reasonable to forecast the population to rise to whatever level is necessary to overwhelm food supply, for any level of food supply.
That can be fixed in principle, but the only solutions I can think of requires tech that makes the two forms of social/mind control in Westworld seasons 3 and 4 look like a child's finger painting in comparison to the filmography of the aforementioned show.
Only, we can't do that by just dismissing any discussion of the current problems — the best way to have a catastrophe is to ignore all the problems.