[musgravepeter]

"The discovery still leaves much of the universe undetected. About 85 per cent of its matter is thought to be "dark matter" — that which is undetectable using ordinary methods."

If I understand the abstract, it reports finding "Ωb=0.051+0.021−0.025h−170 (95 per cent confidence; h70 = H0/(70 km s−1 Mpc−1) " which I think means 5% of the total (mass+dark matter+dark energy), since cosmology assumes Omega total = 1.0

[acqq]

The relevant part of the abstract: "we derive a cosmic baryon density of Ωb=0.051" .. "This independent measurement is consistent with values derived from the cosmic microwave background and from Big Bang nucleosynthesis."

So they derive the Ωb independently and get the value compatible to what we already know to calculate using CMB and BBN.

https://en.wikipedia.org/wiki/Lambda-CDM_model

"Calculated values : Baryon density parameter[b] Ωb 0.0486±0.0010[e]"