they're clearly talking about time dilation during their stay in "brahma loka." no motion here. why are you dragging time dilation due to velocity when they're talking about time dilation due to gravity?
creator would be living in sagittarius a?
sagittarius a* or an equivalent mass is a good candidate to provide enough time dilation. i tried with solar mass, but results were negligible.
one year of travel might correspond to ten years on Earth
30 years of travel is 300 years, and not 27 caturyugas. assuming there are 12 years in a yuga, one needs to travel at 0.999732c for 27 caturyuga to pass on earth. do you know the energy required to reach 0.999732c ? 4.93×1020 joules. that's more than global human energy consumption per year.