It is true in Europe
Single pilot exemption, perfectly valid in the US, is no longer permitted in the European area as EASA rules for aircraft flying in the JAA region are that aircraft over 5700kgs MAUW will be two crew - end of story. You can still obtain a Single pilot rating on annual recurrency at places like FSi, but the aircraft still needs a rated co-pilot when operated.
There is a way round this. P2 only requires a SiC rating, which is 3 take-offs and landings (one assymetric) as sole manipulator of the aircraft, plus training in aircraft systems and procedures (both emergency and normal). This can be signed off by any rated ATP, then submitted to the FAA for inclusion on your licence.