Argument: The money can be spent over a long time and like will be able to be spent.  

The footnote on the main question says:

In total. You can imagine this is a trust that could be spent down today , or over any time period

Likewise @Will Howard🔹 argues that this isn't that significant an additional amount of money anyway:

"$100m in total is not a huge amount (equiv to $5-10m/yr, against a background of ~$200m). I think concern about scaling spending is a bit of a red herring and this could probably be usefully absorbed just by current intervention"