>why did they post Israel flag on Instagram? possibly creating another refugee wave sounds counterintuitive to what they stand for
It's clear that anti-migration is a pro-israel policy. If one actually think of it, Orbán's anti-immigration stance does not comes from his wish to protect Hungarian people, European culture, Christian values, the family, and the grandma's cookies, but because the Jews in Europe has to be protected from Muzzies.
Here anti-immigration tunes in govt/Fidesz media were never stronger than now.