I didn’t hear about any gates being welded open during Trump’s administration and the way he reduced the number of border crossings would suggest that if it happened, it was unbeknownst to him. Any logical thinking person should be able to look at those gates and recognize them as personnel gates, that will allow water to pass through easily. Looking at the small debris collected at the bottom of both the wall and the gates shows that this, indeed, has been happening. You can see that the water current flows in the direction the camera is pointing. These gates/doors open against that current, which would act to increase any pressure that might be applied. The fence/wall is designed to allow water to flow through when the gates/doors are closed. Their size and shape are personnel design. Maybe critters, too.
You be careful what you read. Sense ain’t so common anymore.