Even if it where true: That is money well spend. 115 billion over 10 years is not that much for 27 countries combined anyway.

Afaik the EU27 public expenditure for 2025 alone was 9.32 trillion[1]. So we are talking about ~11 billion a year vs 9.32 trillion which is ~0.1% of public expenditure of the EU27. I think if we want we can handle that.

[1] https://ec.europa.eu/eurostat/databrowser/view/GOV_10A_MAIN/default/table?lang=en

Edit:

Am I right in thinking that the study does recognize a spending shift towards the EU but doesn't treat that shift as an offset against the 115 billion?