This is true if the only thing you’re concerned about is the depth of the tabs (“length” is prolly a better term for this measurement). You don’t need to kerf-compensate tab length.
Assuming you consider the “tab” to be the part that sticks out (as opposed to the “slot”), you will actually want to expand the width of the tabs.
It doesn’t matter if you’re cutting out tabs, slots, or kitty-cats. For all closed shapes you offset all lines by half the kerf width. For the outsides of closed shapes you offset to the outside, for the insides of closed shapes (AKA “holes”) you offset to the inside.
There is no need to do special kerf compensation based on what the shape you are cutting will be used for. Rectangles are rectangles and the laser doesn’t know or care that you’re calling one of them a “tab” and anothet one a “slot”. Make it easy on yourself and also make your design better by offsetting ALL of the outside perimeter outward by half the kerf width and ALL the inside perimeters inward by half the kerf width.
…Sorry, no such luck, @Hirudin of the past.