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Local Group is Isolated in Space

Our local group is isolated from its  surrounding space and is not part of the expansion of the universe.

I discovered this oddity a long time ago but I don't know if everyone else knows.

An assumption about expansion dates back to 1936 about our local group.


The 1999 paper in arxiv.org is titled:

THE LOCAL GROUP OF GALAXIES

from that paper:
'
Hubble's (1936, p. 125) view that the Local Group (LG) is "a typical,
small group of nebulae which is isolated in the general field" is confirmed by
modern data.
 The zero-velocity surface, which separates the Local Group from the field
that is expanding with the Hubble flow, has a radius Ro = 1.18 " 0.15 Mpc.
'

I can find nothing online that takes exception to Hubble's isolated group.
Apparently (from a paper like this) most cosmologists are comfortable with our local group on its own 'zero-velocity surface.' This surface terminology brings up the unfortunate image of our local group on a flat plate floating on a river heading for the waterfalls.

Regardless of whether the image is a plate or a ball this assumption the rest of the universe behaves differently than the universe closer to us on Earth than 4MLY is incredible.

How can the claimed expansion of the universe in all directions accommodate none close to Earth?
This implies the fabric of space has a defined seam in it, similar to plate tectonics but this is a round piece of fabric with an observed radius around 4MLY.

I added this comment:
I had posted about blue shift galaxies on April 18. M31 is the problem forcing the local group island. If blue shifts were handled right, as shown in that post, and if red shifts were handled right, like in my April 24 post, cosmologists would never imagine a ridiculous spherical island for us in the fabric of space.

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