Hello Vilas, =)
I did not express myself clearly: Yes we shall definitely not fly below VLS. What I try to say is that if for example you are flying with A/THR off and your speed drops slightly below VLS, There is no reason to panic, the aircraft is not going to be on an undesired state as long actions are taken without undue delay. the FCTM states that VAPP can be as low as VLS in case of A/THR off, no ice acreation etc... Surely if your target speed is VLS, they might consider the fact you might fly below it inadvertently. I personally always keep a nice minimum of 5 kt margin from VLS regardless of the kind of the approach. I rather have too much energy than too little.