if it is the small Atom splined remover size the splines have a V cross section, akin to saw teeth, rather than the rounded cross section shown on the ebay tool. ebay tool looks more like the Shimano pattern of splines.

Phil Wood made an investment cast remover for the small Atom splined which is thin wall so the axle locknut and spacer do not need to be removed.

SolBadGuy you are not mistaken with the use of Atom vs Maillard. Atom is one of the brand names of Maillard.