He most certainly alluded to this fact. People in the OT were saved, born from above, and Nicodemus should have know this fact, John 3:10 &c.
One flaw that exposes people like you is you say OT saints weren't saved, then misquote Joshua 24:15 as a gospel invitation to them to be saved. LOL!!!!!!!!!
Anyhow, it appears you should change your moniker to Devotionto
Pelagius.