Also, given that it does not include a detailed section of why such texts were not accepted by the majority of Jews who survived the 2nd Temple period and why they were not found in Jewish communities that survived outside of Israel after the 2nd Temple period.
For example, here is an important quote from another part of the article.
What is their importance?
When these books were first studied, scholars realized that they could help to provide a context for the understanding of the origins of Christianity. No longer was rabbinic Judaism to form the primary basis for comparison with the earliest Christian literature, but rather the Jewish literature of the Second Temple Period, and particularly the Pseudepigrapha, could contribute much insight, making the Jewish origin of Christianity more comprehensible.
I.e. since the original Jewish Christian started they may have, for a time, just been a group of Jews with non-standard ideas that they were getting for questionable sources. Yet, as time went on they took those questionable sources and built something so distant from Torath Mosheh that the normative Torath Mosheh Jewish communities throughout the Middle East and the early Jewish Christians seperated. The questionable texts became a primary source for the early Jewish Christians and the normative Torath Mosheh finally put the text in ignore bin.
Further, when one states "Jewish literature" one can be talking about a Jew, who keeps no Torah, and wrote something. One can also be talking about Jew who writes something that has no historical basis whatsoever. I.e. just because a Jew writes doesn't make it Torath Mosheh, and for Torath Mosheh Jews something is only valid if it meets the criteria of Torath Mosheh - these texts were deemed to not meet that criteria by all surviving Jewish communities.
Yet, within two generations the Jewish Christians dissappeared off the historical map to be replaced by non-Jewish Christians. Thus, the value of those lost any relevance to the Jews who had originally championed them.