Did the Tathāgata actually obtain the Dharma from Dīpaṃkara Buddha or not?

Original text of the Diamond Sutra: 佛告须菩提。于意云何。如来昔在然灯佛所。于法有所得不。不也。世尊。如来在然灯佛所。于法实无所得。

The Buddha said to Subhūti: What do you think of this question? In the past, when the Tathāgata was with Dīpaṃkara Buddha, did he obtain anything in terms of the Dharma? Subhūti replied: The Tathāgata obtained no dharma whatsoever, World-Honored One. When the Tathāgata was with Dīpaṃkara Buddha, with respect to the Buddha's Dharma there was truly nothing attained.

Our original teacher, Śākyamuni Buddha, realized the stage of an eighth-bhūmi bodhisattva at the ancient Buddha Dīpaṃkara's place and received the prediction of future buddhahood. He clearly realized the stage of an eighth-bhūmi bodhisattva, so of course he obtained the dharma of the eighth-bhūmi bodhisattva, and he was clearly given the prediction as well—all of this was something attained. So why is it said that nothing was attained? Because these events exist in the phenomenal realm, yet in the ground of actual principle there is no such thing. The phenomenal realm is empty, being illusorily manifested by the vajra prajñā mind—existing, yet not existing. Within the Tathāgata's mind there is likewise not a single dharma, no attachment whatsoever; he does not consider that he truly attained the dharma or received the prediction. If the Tathāgata had taken these as real, there would be dharma in his mind, and he would not have realized the emptiness and illusoriness of the attained dharma; he would not be an eighth-bhūmi bodhisattva and would not be qualified to receive the prediction. It was because the Tathāgata possessed the realization of an eighth-bhūmi bodhisattva, with a mind empty, unconditioned, and without any thing, that the ancient Buddha Dīpaṃkara bestowed upon him the prediction of buddhahood.

Ordinary people can never think this through no matter how they ponder it: the Tathāgata attained such a great dharma, yet said he attained nothing; such a momentous matter as receiving the prediction of buddhahood, yet he did not take it seriously, without the slightest hindrance or thought about it. What kind of mind is this? If ordinary people encountered such a thing, they would long since have been elated, thrilled to the extreme, and rushing about to tell everyone. Of course, this is the attainment-seeking mentality of ordinary beings who have not realized the true reality, which is precisely why such ordinary people cannot attain the dharma, let alone receive the prediction. The Buddha's mind is transparent and his eyes are bright; he would not casually bestow predictions upon people.