The T&Cs say:

Eligible Stays and expenses deemed eligible expenditures, as per these Terms and Conditions, defined herein, entirely paid for in full with Reward Points do, however, earn Status Nights, provided that the conditions for so doing, as defined in the Programme TCM, are met.

This does say "entirely paid" but earlier:

Status Night: An overnight stay completed by a Member that earns Status Points and that counts towards reaching a Status level according to the scale presented in Article 8. Only overnight stays by a Member as part of a stay at a hotel participating in the Programme, booked through an eligible distribution channel at a rate eligible for earning Points, as described in Articles 7.1 and 7.2 below, are considered to be eligible.

And:

7.2 Earning Points as part of an Eligible Stay.
Conditions for the effective completion of an Eligible Stay. When a Member completes an Eligible Stay in one of the hotels participating in the Programme, including at least one paid night spent at the hotel by the Member in question, the Status points and Nights corresponding to their stay will be credited to their account. Day Use shall only result in credited Points; however, Status Nights will not be added.

It seems Accor IT is set up to only count an Eligible Stay as one that "includes at least one paid night" high enough to trigger points, which means spending at least EUR10 in eligible expenses. Not how I read the T&Cs should be interpreted, but how in practice it seems they are.