'Acrylic' does not mean 'water-based', the word acrylic has bupkis to do with water, it is a reference to the chemistry of the resin used in the paint. 'Acrylic' resins used in paint are in the same family as those used in Plexiglas or Lucite or Perspex.
BTW, true 'cellulose' lacquers have been thin on the ground for a very long time, the synthetics (phenolic, acrylic etc.) displaced them decades ago for most uses. The term 'cellulose' has survived as a generic, just as 'enamel' is, incorrectly, used as a generic for oil-based paints. Oil as in linseed, tung, soya etc., not 'petroleum', BTW.
The Airfix website states that the sprays are 'solvent-based'.