The reference to Panda is irrelevant. It's just a spam email full of tech-speak to try to part you with your money.

If you want to have some fun with them, email them and ask them why their own Google search results are so poor that they feel it necessary to email potential customers. Tell them how disgusted you are that they would place information about your website on a public forum, proving just how unprofessional they really are and you would never deal with such a cowboy outfit whose own search results were garbage. Point out that your site's SEO can't be that bad, after all they found it!

But ultimately I would just ignore them, edit the comment to your own liking and strip out all contact details and then publish it as a glowing reference to your own website!

Hi Christine,
Wow, I'm experiencing deja-vu! I believe I've gotten this same Spam comment in mine a few times before. I'd follow Andy's advice and mark the comment as spam and delete it.

As for plugins follow the training here at WA and use the plugins they recommend. I usually avoid plugins as much as possible, and only use ones that others here at WA have found to be good and they're also free to use. Otherwise, plugins can really slow down your site and may cause a lot of other problems that will really mess it up. -Sherry

It's garbage

Andy is bang on, I have seen similar. Always report as spam.
Bill

Ignore and report as spam.

You are right, the latest Google update is hummingbird (10/2013). The Panda update is from February 2011. But there is quite a difference between both updates: Panda is more quality oriented and Hummingbird more quantity. There are some plugins that do analyze the content of a page or post based on the panda scheme. But nevertheless, even if the plugin may be of good quality, it is a spam comment, you should delete the comment.

Hi, Christine...they all want to make money...:-)...maybe you would like to read my latest post? Shouls clear up some of the misunderstandings....:-)...wishing you a wonderful day !
https://my.wealthyaffiliate.com/isimaus/blog/some-news-from-google-bing-and-the-other-kids-downtown/comment/1355069

Christine, I have recently read a similar post to yours. The reason I remember it is because the person was asking whether this was true and we told him that a keyword density of 3-5% is way too much nowadays.

I would do what Andy suggests.

I got something similar, but not as detailed. Have you activated Akismet plugin on your blog? It may catch spam comments so you don't have to be bothered with them.

so it is essentially a marketing ploy to get you to buy a premium plug in.
Plug ins can be malicious and present security risks.

If it were reputable, I suspect that an email would have been the preferred route...this way if you publish the comment and leave their website url intact then they get a back link anyhow.

Avoid, mark as spam, then delete permanently IMO.

Best wishes, Andy