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So to reiterate: You capture a city of another race. Now you can:

1. Raze it - no tech.
2. Migrate it - no tech.
3. Absorb it - yay tech.
4. Absorb and THEN migrate - yay, then nay.

Do I understand it correctly?
 
Almost, once you have unlocked the Tech Tree you do keep it so it's more like:
  • Raze it - Nay
  • Migrate it - Nay
  • Absorb it - Yay
  • Absorb then Migrate - Yay (We stole your stuff and then removed you.)