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Hello,
Thanks for your question.
Yes, this is possible, but it will not be limited to only that sentence. I can hide the entire first paragraph (first two sentences) and leave the branding-less sentence that indicates the number of sitemaps included.
I am not entirely sure when I have the time to implement this. Very likely I will add it to a new version that will contain a few other things too.
If you want to hide it in the meantime, you can check out the solution over at Github where I have made a new ticket based on your feature request here: https://github.com/senlin/so-clean-up-wp-seo/issues/109 .
I will therefore close the issue here and you can use the Github thread for follow-up.