Your original question did not make it clear whether you were on a closing heading and told to intercept the localiser. If so, then it is quite clear: Descend now to 2800 ft on the intercept heading. Level off at that level if necessary until established on the localiser and the glidepath comes in, then follow that. I think he might have been trying to avoid the situation where he was busy doing something else and then you didn't descend on the ILS (as you shouldn't without clearance) when you intercepted the glideslope.
If you weren't on an intercept heading then I would take it to mean descend now to 2800 feet and expect further descent on the glideslope of the ILS when cleared to establish. In essence it's no different to descending to platform height on a procedural ILS and then following the glideslope down.
I suppose only he knew exactly what he meant. Like many questions posted here, if you are not sure what we mean, ASK AT THE TIME. Better that than making an assumption and at best getting a B******ing and at worst a close encounter with another aircraft or the ground!