The unemployment rate was 20%+ in the Depression. It is 3.8% or so now.
A car is actually more affordable using his numbers. Cars last four times as long and require less maintenance. Plus they are much safer and have a lot more features. The average sq footage for a home in 1930 was 1100 sq ft. It is a 2500 sq ft today. So an equivalent house would be 6.8 times income in 1930 vs 7.8 times 2023 income using his numbers. Hardly a big difference and especially so given how historically stretched home prices are right now from your chart.