No, not true.
Recent estimates put Israeli settlers in the West Bank + East Jerusalem at ~750,000 (close to the 800-900k range, with ongoing growth).
Many work—often commuting to jobs in Israel. Unemployment among settlers has historically been low (~6%). The Israeli government provides subsidies for housing, security, and infrastructure in settlements, plus standard national services like healthcare. But they aren't "none work, free everything."
US aid (~$3.8B military) goes to Israel's defense broadly, not directly funding settlers' civilian benefits (that's Israel's budget). Private donations exist but aren't "your tax dollars." The post exaggerates heavily.