`history` is equivalent to `fc -l`, and `fc` is the actual Zsh builtin. Add the `-n` flag to suppress event numbers when listing.
@@ -37,4 +37,4 @@ setopt HIST_VERIFY
# Lists the ten most used commands.
-alias history-stat="history 0 | awk '{print \$2}' | sort | uniq -c | sort -n -r | head"
+alias history-stat="fc -ln 0 | awk '{print \$1}' | sort | uniq -c | sort -nr | head"