yes that is definitely hdr
but hdr will not give you still reflections, btw
if the water is choppy and you do not have nd filter, it will not smoothen out ripples for you
what hdr does is give you detail
danielkhc has many nice hdrs, a big mix of what i would term realistic looking and another pile of what i might term junk, but he has moved on to digital blending which is definitely much nicer than hdr, in my opinion. it is a pity that i do not always have the time to blend all my photographs.
if you want my opinion, i think it is timing, more than anything else. if there is wind and the water surface is not calm.. even 30 second exposure cannot solve the problem
gotta go now, running out of laptop batt with no access to power point
cheers