It says false because there's fewer homeless and more vacant homes than the meme quotes. That doesn't negate the point of this post at all.

Tom Murphy, director of communications for NAEH, told the Daily Caller News Foundation in an email that the figure for homelessness doesn’t reflect the most recent data, saying, “The last time the numbers were in that range was 2010, when the count was 637,077. The most recent federal data is for 2018, when the count was at 552,830.”

The Census Bureau tracks the number of vacant homes in the U.S. on a quarterly basis and, as of October 2019, the number stands at about 17 million. That’s roughly 3.1 million more than the meme suggests.