If I uncheck "Available For Tagging" from a global termset can I still access it programmatically?

Question

If I uncheck "Available For Tagging" from a global termset can I still access it programmatically? The answer would appear to be "No". I have a console app that uses 
TaxonomySession session = new TaxonomySession(site, true);
var termStore = session.TermStores[0];
termStore.UpdateCache();
var group = GetTaxonomyGroupByName(termStore.Groups, "Global Termsets");
TermSet globalTermSet = group.TermSets.FirstOrDefault<TermSet>(e => e.Name.Equals("My termset", StringComparison.CurrentCultureIgnoreCase));
OR
TermSet gts = group.TermSets["My termset"];
If I uncheck "Available for Tagging" this this fails. When I re-select "Available for Tagging", it works.
Obviously, this is the way SP is designed (I think) but my question is
why? I don't want my navigation termset being used for tagging. I have a different termset for that. This suggests that tagging also controls api visibility to the termset. Is this something that other experienced developers can comment on?
Thanks!

Answer 1

The only way to get to the unavailable terms is through the session.GetTermsInDefaultLanguage, GetTermsInWorkingLocale and GetTermsWithCustomProperty. All three of these methods offer arguments to exclude or include unavailable terms. You can also call these
methods on the TermSet its self.
https://msdn.microsoft.com/en-us/library/ee568627(v=office.14).aspx
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