I think there is a typo, it has been corrected on several guides:
BrowserMatch bMSIE !no-gzip !gzip-only
BrowserMatch \bMSIE !no-gzip !gzip-only
Also, I'm hoping your line got truncated as I did on the mongrel
apache2 guide here:
AddOutputFilterByType DEFLATE text/html text/plain text/xml
That should all be one line.