Probably out of the screen.
dxDrawText doesn't require width and height.
It needs a start-point(x1,y1) and end-point(x2,y2).
Between those points is the box where your text is placed.
local startX, startY = 0, sY - (sY*0.5)
local endX, endY = sX, sY
dxDrawText("Alpha 1.0.2 still work on Developer",startX, startY, endX, endY, tocolor(255,255,255,230),tables.fontSize,tables.font,"center","center",false)
(I can't figure out the text position based on your code)