Where did you find these pieces of information, sources please?
Likely internal info, much like many sources on this forum. I imagine it will drip feed to other sources later this month and into August.
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With the levels of drivers knowledge is there the possibility that Heathrow/ reading services would run towards Shenfield as a service recovery strategy ( For example if anywhere between Canary wharf and abbey wood was blocked for any reason)
Unlikely in large numbers due to the additional length of time (it’s about 15 minutes Whitechapel - Abbey Wood). Obviously it would depend on the exact location, but Custom House could still be used potentially and there’s not loads of turnback locations on East that are as close.
Instead I find it more probable services would be thinned out with some running into Paddington HL.