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The word "revealed" implies that some supernatural source gave some hidden knowledge to a human.

are we certain?

the Dhamma (Truth) was certainly something "hidden" from man until the Buddha discovered it

Monks, whether or not there is the arising of Tathagatas, this property stands — this steadfastness of the Dhamma, this orderliness of the Dhamma. The Tathagata directly awakens to that, breaks through to that. Directly awakening & breaking through to that, he declares it, teaches it, describes it, sets it forth. He reveals it, explains it & makes it plain

Dhamma-niyama Sutta did 'something' reveal the Dhamma to the Buddha?

immediately after his enlightenment, the Buddha made the following exclamation about 'revelation'




Yadā have pātubhavanti dhammā,
Ātāpino jhāyato brāhmaṇassa;
Vidhūpayaṃ tiṭṭhati mārasenaṃ,
Sūriyova obhāsayamantalikkha

When things become manifest (John D. Ireland)
To the ardent meditating brahman,
He abides scattering Mara's host
Like the sun illumining the sky

As phenomena grow clear (Thanissaro Bhikkhu)
to the brahman — ardent, in jhāna —
he stands, routing Māra's army,
as the sun, illumining the sky

When the nature of things becomes really manifest (Anandajoti Bhikkhu)

Truly, when things grow plain (Buddhanet)

Indeed when things become apparent (Ven Aggacitta)

All dhammas revealed themselves to him (Shiro Matsumoto)

As soon as (the true nature of) things is revealed to him (Vimalo Kulbarz)

With composed mind appear true views (Pali Text Society)

When the real nature of things becomes clear (Professor Ko Lay)

Ud 1.3