The Baldwin Acrosonic name was made in three models, with different heights. The lowest "spinet" model is "complicated" in the sense that any other spinet is complicated, because most of the action is below the level of the keyboard not above it and therefore less easily accessible for doing repairs to just one or two keys.
It's hard to believe a tuner would re-voice the whole piano without asking you first - and charging you for several hours extra work compared with just tuning it, if he/she did a proper job!
Maybe the unisons have been tuned too "perfectly in tune," which tends to kill the brightness of the tone.
I suppose it's possible the tech took the action frame out of the piano to do the repairs and didn't replace it in exactly the same position, which could affect the tone because a different part of the hammers would be striking the strings. Whether it was actually "out of position" before the work was done, or replaced in the wrong position afterwards, is an unanswerable question without actually seeing the instrument. (We're talking fractions of a millimeter here, not a gross error!)