Since you’ve used the true argument for get_post_meta, $blogimages will be a single array, not a multidimensional one.
So instead of $blogimages[0]['blog-image-inside'], just use $blogimages['blog-image-inside'].
For absolute sanity, you might also want to check $blogimages before you use it:
'exclude' => [
$thumb_ID,
isset( $blogimages['blog-image-inside'] ) ? $blogimages['blog-image-inside'] : 0,
isset( $blogimages['blog-image-front'] ) ? $blogimages['blog-image-front'] : 0,
isset( $blogimages['blog-image-main'] ) ? $blogimages['blog-image-main'] : 0
],
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