Postman: the adding of the 'disputed' tag is not, as I hope you appreciate, a personal comment on your posts. If a site is currently unrecognised by English Heritage (for example) this does not necessarily rule out prehistoric connections. The tag therefore provides a useful way for visitors to the site to distinguish between 'definite' sites and contributors' suggestions, and also acts as a request for more information. As you had reasons for suspecting the Low to be an undiscovered site, you could add perhaps a fieldnote or miscellaneous post to your photos.

The TMA Eds use a number of resources to research 'disputed' sites and yes, sometimes those with apparently no supporting evidence (including sometimes a lack of explanation from the poster themselves) or those discovered to be of the wrong period, are deleted. The intention of this is to maintain the leanness of the website and not to act as 'suppression'.

You may also want to read the following post, which sums up the same ideas:
http://www.themodernantiquarian.com/forum/?thread=37863&offset=75

TMA Ed.