This is purely a word game. Pastel has at least 2 meanings. One is an artists chalk. So white is a pastel color. But the other meaning is a pale color - a tint. And in fact there are many tints that are almost white but not completely white. read more
There are color tools in art termed “pastels” which are a powder-based media having low to medium color saturation. A pastel color is that which is produced from such a media, a low to intermediate color saturation. read more