Its about Election not Ethnicity. It's about God's Word not failing to Israel because a Remnant were saved according to the Election of Grace.
The term 'All Israel will be saved' in Romans 11v26 when understood from the context and comparing Scripture with Scripture can only mean 'All Elect Israel'. This is what the apostle Paul actually says. He does not argue for a future national saving of ethnic Israel because that is NOT what it means.
In this podcast the real 'Replacement Theology' is exposed as well. Revelation 19v10 says that 'the testimony of Jesus is the spirit of prophecy'. This means that all prophecy including ';end times' prophecy has to be centred on Jesus not anything or anyone else.
If something else becomes the centre, it can only mean that Jesus has been replaced. Therefore Christian Zionism which puts physical ethnic Israel at the centre of all prophecy especially 'end times prophecy' has truly REPLACED the Lord Jesus. Christian Zionism aka Dispensationalism is therefore the real Replacement Theology- That's called Inversion.