Nope.
https://www.simplify3d.com/software/release-notes/Using a first layer height below 100% will now correctly reduce the amount of extruded material (alternatively, a negative global Z-axis offset can be used to lower the first layer while still extruding the same amount of material)
This change was introduced in v4.1.0, so you can't simply lower the 1st layer height to get more squish as in previous versions.