The information to be provided pursuant to Articles 3 and 4 shall be obtained by reliable, accurate and reproducible measurement and calculation methods, which take into account the recognised state-of-the-art measurement and calculation methods, as set out in Annex IV.
Article 6
Verification procedure for market surveillance purposes
Member States shall apply the verification procedure laid down in Annex IX when performing the market surveillance checks referred to in Article 8(3) of Regulation (EU) 2017/1369.
In the absence of relevant standards and until the publication of the references of the relevant harmonised standards in the Official Journal of the European Union, the transitional testing methods set out in Annex IVa, or other reliable, accurate and reproducible methods, which take into account the generally recognised state-of-the-art methods, shall be used.
the actual legislation is not that specific as far as i can tell:
https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX%3A32023R1669#anx_I
They also say this:
So I remain hopeful.