If the load is purely resistive, yes; VA or volt amperes is "apparent power' and can be considered the same as watts (real power). If the load is reactive, i.e. anything with capacitors or inductors, then the actual power "real power" consumed will be less.
Another way of saying it: You would only use a dimmer on a purely resistive load, i.e. Tungsten lamp. As long as your lamp is rated 1000w or less, preferably less, you are good to go.
Yeah its a household dimmer for a 800w redhead. The 2kw Harbor Freight Dimmer seems only available to a US power supply, otherwise I would be buying that