A couple of additional points on how the "low-RAM" works:
1 - https://www.lifewire.com/understanding-compressed-memory-os-... : Apple devices have support for memory compression, see https://opensource.apple.com/source/xnu/xnu-2050.18.24/libke...
2 - Apple devices support something called "jetsam", which basically frees up memory from unused/background apps by killing them in order to keep high priority apps running smoothly: https://developer.apple.com/documentation/xcode/identifying-...