I read in the Thaiger last night that the visa amnesty is extended until sept 26th. But cannot find it in any other mainstream Thai papers.

Does anyone know for sure, Or is it the usual speculation again.

is it approved as actually in Law?

There are no exact details.

Do tourist visas have to  report before 31st July?

It is official since it was approved by the cabinet yesterday.  There should be a announcement by immigration tomorrow after it is posted in the royal gazette.

See this topic. https://forum.thaivisa.com/topic/1173997-khaosod-report-amnesty-extended-to-sept-26-cabinet-approved/

No need to do anything at immigration. It is the same amnesty as before.

No need for another topic about it. This one