A flight can only meet Cat A requirements if you : meet the CAT A Weight/Altitude/Temp requirements; the engine power assurance check is acceptable; you fly a Cat A profile for T/O & landing.
If you dont meet all the above requirements, then you must be Cat B, so its not true by a long shot that "all flights are Cat A"!
On closer inspection of the RFM, I take back what I said before about a lack of clarity. On page S12 L-11, it quite clearly says:
Note The training procedures may be carried out up to the end of Take off path (ie 1000' ATS (300m) and to the completion of landing / balked landing.
No performance information ( distances and climb gradients) are provided for the applicable training WAT weights, therefore the continued Takeoff, rejected takeoff, continued landing and balked landing distances presented in this supplement are NOT applicable for training procedures.
So it categorically states that you cannot use OEI training after 1000 ft, which may interfere with IFR missed approach procedure training ( depending on how you do it.)