No,I don't agree with that.You should never stop giving more space to your plant.It doesn't matter if it is in veg or flowering.Since LST is a bending method,you can bend and give more light to branches any time it seems to be necessary.I still bend some branches in flowering,when they forming buds and those buds position themselves to the light.They even make some new growth right under the bud that is positioned under the light and I get many other new buds.
To me,your plant doesn't need any more lST atm.one main cola,three bottom colas and they are all separated.A couple of weeks into flowering,observe again if there are some little branches that stay under some big leaves.Bend them or bend the leaf to get more light to that branch.Thats it.