Actually theres a fair bit of inaccuracy there, https://bellejar.ca/2013/03/28/easter-is-not-named-after-ishtar-and-other-truths-i-have-to-tell-you/ explains it pretty nicely. For those who dont want to click here are the main points:
"Ishtar was associated with fertility and sex. However, her symbols were the lion, the gate and the eight-pointed star; I can’t find any evidence of eggs or rabbits symbolically belonging to her. And Easter has nothing to do with her. "
"Most scholars believe that Easter gets its name from Eostre or Ostara**, a Germanic pagan goddess. "
Re: Constantine "when he was alive, English didn’t even exist yet. He would have spoken Latin or Ancient Greek, so would likely have referred to Easter as Pascha or Πάσχα. "
So while you're right about Christianity stealing yet another holiday and branding it as their own, this is one of those they took from Paganism