this seems a spurious sakhi because Amar Das ji's mind was won over by the singing of gurbani by Bibi Amro ji , he had no NEED to test the Guru , he was totally overjoyed to finally find his Guru ji ever read 1st pauri of Anand Sahib ?
I would say the dream was 100% linked to his dad. My families done sangat and seva of both Sant Isher Singh Ji and Sant Kishen Singh Ji. They were pure brahmgianis. We cant narrow the avasta of a Mahapurakh to our level of thinking.