The presence of GOD and the power is moving through the 'gifted man of GOD' in the meeting places, and people 'fall' to the ground is 'true' as we have 'witnessed'.
In the account of the HOLY BIBLE, we have learned during the presence of GOD and when HE spoke, people 'fall' to the ground, as though they were dead or paralysed. Such account of a believer who 'experienced' and 'explains' such, even today, can be considered and is to be 'true' and also of 'truth'.
When JESUS answered three times, 'I AM', to those who came to arrest HIM and asked about HIM, they 'fell back' also three times at HIS answer.
But 'interpreting' and making a 'doctrine' that came from 'weak men' justifying one is being 'Slain in the SPIRIT' can be considered as 'false'. i believe this 'term' came about 'deceivingly' and commonly used by 'weak' believers, just because 'witnessing' the 'man of GOD' in the meeting places, where he 'swings his arms like a sword' on people in front of him.
Apart from this, i believe the 'deliverance' from 'demon' or 'evil spirit' oppression in such meeting places, can be considered as 'true'. Sadly this has become an 'attraction' for many believers and strongly tend to attend or be in one regularly. And also many come back for 're-deliverance' again and again.
GOD's HOLY SPIRIT 'gifts' may have or being used in 'vain' and this results to 'lawlessness' of the church. Also 'exposing' this and such events, we cannot not 'generalize' all of them are 'one', because there are 'spirit and truth' operational ones out there for the Kingdom of GOD, with CHRIST and the HOLY SPIRIT according to the HOLY BIBLE.
Thank you and may GOD bless you all in the name of LORD JESUS CHRIST.