QDuring this turn, I bloomed my Debut holomem 〈Gigi Murin〉 to hSD13-011 〈Gigi Murin〉, and archived the Debut holomem 〈Gigi Murin〉 stacked to hSD13-011 〈Gigi Murin〉 with its bloom effect "I am Gonathan G.". In this case, can I use hBP06-090 〈Bloom Stage〉 to bloom once more?

AYes, since the holomem fulfills the condition as a "1st holomem that bloomed from Debut holomem this turn".

QWhat does the "if there are no holomem stacked to this holomem" of hSD13-011[Gigi Murin]'s Arts "In Search of What It All Means" mean?

AIt means that there are no holomem cards under hSD13-011[Gigi Murin].