Combustion is required to decarboxylate the THC (which is why eating raw bud will not get you high). Obviously the workaround would have the juice decarbed but I think that it would be difficult to find that in the wild.
Eating raw cannabis will absolutely get you high, and heating it doesn't noticeably affect the potency.
"Decarboxylation" or the removal of a carboxyl group, where it's usually released as CO2, is a common reaction in chemistry, and it doesn't tend to require a lot of activation energy. Every amino acid is decarboxylated after you consume it. Carbonic acid in soda decarboxylates itself at standard atmospheric temperature.
And in the case of your stomach, the HCl will decarboxylate the weed you eat just fine.
Instead of spreading stuff like this, just go and try it. It's really kind of exasperating to read outright fabrications, but when they are this easy to disprove I can't even see a charitable interpretation of why you would do so.