Should I add 43.5 and 90.2 tonnes?

No. April’s addition is already part of the half-year total.

Does this establish a monthly buying programme today?

No. It does not establish 2026 purchases or a recurring programme.

Dated source reference; not a live quote.

April 2021 addition

43.5 tonnes.Source: World Gold Council article, 10 June 2021 · As of: 2021-04-30

First-half 2021 addition

90.2 tonnes in text; underlying chart shows 90.19 tonnes.Source: World Gold Council, GDT Q2 2021 · As of: 2021-06-30

Should I add 43.5 and 90.2 tonnes?: No. April’s addition is already part of the half-year total.
Does this establish a monthly buying programme today?: No. It does not establish 2026 purchases or a recurring programme.