It's because none of those companies is considered "Information Technology" according to the official GICS criteria [0] used to classify companies in the index. For instance, Meta and Google are in the "Communications Services" sector; Amazon is in "Consumer Discretionary." There are 69 total companies in the S&P 500 in the "Information Technology" GICS sector [1], and all are excluded from SPXT.

[0] https://en.wikipedia.org/wiki/Global_Industry_Classification...

[1] https://en.wikipedia.org/wiki/List_of_S%26P_500_companies