I can only speak about the 2012 MBP and the 2013 rMBP, neither of which demonstrate any issues at all with dissipating heat.
You example is from 7 years ago. The entire MacBook line has been completely changed, inside and out, since then.
You example is from 7 years ago. The entire MacBook line has been completely changed, inside and out, since then.
Or if the laptop was shipped without the screws which hold the heatsink in place (happened to me). The thermal throttling can hold for some time, but it'll reach 100 degrees and turn off, even if you aren't doing anything CPU-intensive.
Apple addressed these issues, very publicly, giving an anecdote from 7 year old hardware is still not a great data point for the current state of their hardware.
I do use it for gaming, however. I've played through Portal 2 on max settings. The aluminum definitely gets hot right above the keyboard near the left top corner, but it has never shut down due to heat.