ATTENTION MEMBERS
It appears to be confirmed IF you entered on a 30 day visa exempt entry OR a 60 day tourist visa entry BUT went on amnesty you CANNOT get a 30 day extension now even if you never got the first 30 day extension you were "entitled" to apply for.
The second you went on amnesty you lost that ability :O
IF anyone has gone to their immigration office on a 30 day visa exempt entry OR a 60 day tourist visa entry that is on amnesty and got a 30 day extension please report it here
To all the people I argued with and said you could get the 30 day extension from either of those entries I sincerely and humbly apologize to each and every one of you.
TLDR : Answer Summary
Members have confirmed that if you entered Thailand on a 30-day visa exempt entry or a 60-day tourist visa and subsequently went on amnesty, you cannot obtain a further 30-day extension. This restriction applies even if you have not previously utilized your initial 30-day extension option.