You seems to quote from your own book, which is not a good argument. I
don't agree with any part of your quote.
The verb means, quite simple, "And I dwelt in"
Vadim Cherny
Randall Buth wrote:
Here is a footnote from
Living Biblical Hebrew, v. 3, p.103:
וְשַׁבְתִּי This form is technically the sequential future
tense of
לָשׁוּב "to return" and would mean "and I will return".
However, such a verb would not be expected to be used with the
following preposition ב "in, within". לָשׁוּב expects אֶל to.