Where did you see that? USCIS in its bulletins never releases the number of years only the year it is processing. If you extrapolate the EB-1 wait for Indians, it is closer to 9 years, but most people are in EB-2/3 which is 50yrs out.
If you go back through the last few years of bulletins, this 9 year wait has been relatively stable. Unless you believe there's been a massive spike in applicants in the past few years, there's no reason to believe the current wait for new applicants is 50 or 70 years.
[1]https://travel.state.gov/content/travel/en/legal/visa-law0/v...
[2]https://travel.state.gov/content/travel/en/legal/visa-law0/v...