To put this into perspective:

[1] - imagine the bitcoin address space is ALL the sand grains on planet earth (it's actually much bigger than that I think but this is easier to visualise)

[2] - imagine going to a particular spot in some country with a magnifying glass and identifying a particular sand grain

[3] - now move out from that sandgrain and identify the 5 sand grains **touching** the one you spotted with your magnifying glass. These are the "weak address" sandgrains

[4] - now imagine an astronaut orbiting the planet who lands at some random location and picks themselves a random sandgrain at their landing spot

Now you can see that the chance of collision with one of the 'weak addresses' is almost the same as the chance of collision with the primary address = no weakness at all.

Forget about it. The issue is of theoretical interest only.