1) yes, permanent feature (you did not copy paste the full sms which mention about petrol capping at rm50)
2) no 5% rebate for this case because aeon 5% is on 20th (aeon big 28th)
3) there will be an upfront 5% + another aeon cc 5% in your statement (total 10%)
4) yes, you will automatically receive 2x points (1x aeon cc + 1x aeon member card)

yes, including the 5% petrol rebate on the last sunday too.