The logic of the description in The Tenets of Reform Judaism cited by @ARK96 would seem to imply that it is not a valid source for Noachides. The reason would be that
Reform Judaism differs from the other major movements in that it views both the Oral and Written laws as a product of human hands
Reform Judaism demands that Jews confront the claims of Jewish tradition, however differently perceived, and exercise their individual autonomy
The "Oral Law" is not seen as divinely given at Sinai, but rather as a reflection of Judaism's historic development and encounter with God in each succeeding generation.
As an example, Reform would allow anyone to keep Shabbos fully if they want to which is not allowed for a non-Jew.
A Noachide must believe that the Torah was given to the Jews by Hashem and the Noachide laws are required by Hashem as for example at Must a non-Jew accept the Noachide laws as binding? or Seven Laws of Noah
The Seven Laws of Noah (Hebrew: שבע מצוות בני נח Sheva mitzvot B'nei
Noach), also referred to as the Noahide Laws or the Noachide Laws
(from the Hebrew transliteration of "Noah"), are a set of imperatives
that, according to the Talmud, were given by God[1] as a binding set
of laws for the "children of Noah" – that is, all of humanity.[2][3]
Accordingly, any non-Jew who adheres to these laws because they were
given by Moses[4] is regarded as a righteous gentile, and is assured
of a place in the world to come (Hebrew: עולם הבא Olam Haba), the
final reward of the righteous.[5][6]
According to Encyclopedia Talmudit (Hebrew edition, Israel, 5741/1981, Entry Ben Noah, page 349), most medieval authorities
consider that all seven commandments were given to Adam, although
Maimonides (Mishneh Torah, Hilkhot M'lakhim 9:1) considers the dietary
law to have been given to Noah.
Encyclopedia Talmudit (Hebrew edition, Israel, 5741/1981, entry Ben Noah, introduction) states that after the giving of the Torah, the
Jewish people were no longer in the category of the sons of Noah;
however, Maimonides (Mishneh Torah, Hilkhot M'lakhim 9:1) indicates
that the seven laws are also part of the Torah, and the Talmud (Bavli,
Sanhedrin 59a, see also Tosafot ad. loc.) states that Jews are
obligated in all things that Gentiles are obligated in, albeit with
some differences in the details.3. Compare Genesis 9:4–6.
"Melachim uMilchamot 8:11". www.chabad.org. last two sentences of the three. Retrieved 2015-06-24.
This applies only when he accepts them and fulfills them because the
Holy One, blessed be He, commanded them in the Torah and informed us
through Moses, our teacher, that Noah's descendants had been commanded
to fulfill them previously.
However, if he fulfills them out of intellectual conviction, he is not
a resident alien, nor of 'the pious among the gentiles,' nor of their
wise men.
Mishneh Torah, Hilkhot M'lakhim 8:14
Encyclopedia Talmudit (Hebrew edition, Israel, 5741/1981, entry Ben Noah, end of article); note the variant reading of Maimonides and the
references in the footnote
The Seven Noachide Laws
The Noachide Laws are seven laws considered by rabbinic tradition as
the minimal moral duties required by the Bible on all men. While Jews
are obligated to observe the whole Torah - 613 commandments, every
non-Jew is considered a "son of the covenant of Noah" and he who
accepts these obligations is considered a righteous person who is
guaranteed a place in the world to come.
