The fact is that there is a difference between generations. https://www.theglobalist.com/striding-tall-us-vs-ussr/ - take a look. Men born in the 1920s were on average 167 cm, men born in the 1970s were already 177 cm.
People of that time were definitely lower. For example, the astronaut Yuri Gagarin was 157 cm. The head of the USSR, Nikita Khrushchev - 160 cm. Singer Vladimir Vysotsky - 170 cm, etc.
Nowadays, I get the feeling that guys aged 18-25 are on average 180-182. Maybe I'm wrong, but the facts suggest that average height increases over time.
Undoubtedly but if you take a look at Western nations now and compare height data from 1990 with 2019 you'll see that height is actually plateauing. The height difference between generations is no longer as dramatic as it once was.
For example take a look at height data from the Netherlands, you'll see what I mean. The same pattern is repeating in most Western countries. I don't have the data on me right now, but it's easy to google.
It's something that I used to think about a lot as you hear many people saying each generation is taller than the previous which is true but ,these days ,to a small degree.
Basically, it confirms nutrition is an enormous component of height. Since nutritional levels are hardly changing anymore height is likewise the same.
I don't think using the height's of Soviets is a good idea either since the Soviet Union was shaken for 50 years by major wars,famine and genocide hence many people probably didn't get adequate calories to reach their full potential.
TL; DR it's overstated how much height increased these days , there's not much change as there once was.