It seems he shuts down at a certain point. What do you mean by saying Hebrews and Jeremiah are irrelevant?
Well he tries and uses HEBREWS 8:10-12 which is quoted from JEREMIAH 31:31-36 which is the new covenant promise as an argument against the claim that God's ISRAEL in the new covenant is not all those who believe and follow God's Word. While these scriptures are true. They do not define who Gods ISRAEL as those that are in the flesh while the new testament scriptures define God's ISRAEL as all those who believe and follow God's Word with gentile believers being grafted in.
God bless