Nope it is not legal:
And you can use them in every way you want, privately or commercially — in print, on your computer, or in your websites.
That text is not the license, it's a human readable explanation, describing the license.
When you review one of the fonts on the google fonts page, at the bottom you'll see something like:
3 Styles by Vernon Adams
SIL Open Font License, 1.1
Clicking on the link will show you the actual license. If the font you want to use is under the OFL linked above, then you should be fine.
If you view your bitmap font as a piece of artwork, then there's no restrictions on you at all.
If you view your bitmap font as a derivative, then it itself becomes licensed under the OFL. You can still package/embed it into your game, but you must include the OFL text somewhere alongside it (in your readme or a link to it in your about screen). You can sell your game, encrypt your files, use DRM, etc... however, if someone manages to extract your bitmap font, they're free to reuse it themselves according to the OFL license.
So basically:
- Stick to OFL licensed fonts (or other nice open-source licenses).
- Include the OFL text (or a link to it) along with your games files, mentioning which fonts are covered by it.
- If someone 'steals' the font out of your game, they're free to use it too.
- If you make modifications to the font, it is still OFL-licensed.
- Don't plagiarize and pretend you're the original author.