I can't read the article but yes, I agree it's getting very tedious with people wanging on about events 50 years ago that half the population weren't even born for. Principally, welfare standards are higher now than they were back then so even if it's no worse now, people expect better than " muddling through".
We also have far better prediction models and communication channels these days that make concerns more visible.
But all that aside, heatwaves are more frequent and intense than they were in the past. Temperatures peak higher and humidity is higher, making it feel worse. That's why people and institutions seek to adapt their behaviour and implement temporary workarounds like early school closing.
I do wish people would stop harking back to a time when both the climate and health standards were different.