The physics we know doesn't apply to aliens. They use different physics. Pity you do not know this.Gs don't help much if limited by the speed of light in vacuum. Speed above the speed of light in vacuum is more difficult, more useful to travel long distances, and if achieved using wormholes etc., we may not need high Gs to travel long distance.
E.g. you want to travel 100 light years. At 1 g, you can reach the speed of light in vacuum in less than a year of acceleration (350 days or so). Then you keep traveling for more than 98 years. Then at 1g, you start decelerating almost a year before reaching your destination.
Now assume infinite G, not just 100G. It saves less than 2 years of travel time even if you can reach the speed of light in vacuum instantly. 100G will save even less time than 2 years.
We need roughly 100 years, give or take 2% to travel 100 light years whether we accelerate at 1G, 100G, or infinite G.
Edit : during the acceleration and deceleration phase, the average speed is c/2. So the distance travelled in a year is half a light year. So we can reach anywhere in the universe if we can handle the G forces of 1g - and we will be only a year late than some other species that can handle infinite G.
Had you watched Interstellar you would also know that time also passes differently.
The aliens all want to come to this end of a nondescript galaxy is because, we are the only flat planet that swims through space on the back of a giant turtle.
Better stop with your nonsense, and submit that aliens exist.