UK (and US and other first world countries) achieved this at the expense of other countries' environment under capitalism, globalization, and consumptionism.Malthus was 100% full of *sugar*.
Malthus stated "The power of population is indefinitely greater than the power in the earth to produce subsistence for man". The first UK census revealed a population of 10.5M. Malthus stated the UK would starve at 20M. Today the UK's population is 64M with the highest standard of living it has ever been. Global population in 1800 was about 1B and today it is 7.5B. Insufficient nutrition/starvation is caused by bad political decisions not a lack of arable land, fresh water, and fertilizer.
Malthus definitely didn't predict how technology progressed and didn't see globalization coming. But the essence of his argument is not invalidated yet.