The wikidevi ID is meant as backup for situations where the original wikidevi.wi-cat.ru link is not available (which was the case at some time during the past 4 weeks). It is based on the assumption, that every descendant of the original wikidevi (wikidevi.wi-cat.ru is one of those) has the same link scheme as the original wikidevi.
In this case, the wikidevi link in the dataentry was working for wikidevi.wi-cat.ru due to a redirect, whereas techinfodepot didn't have this redirect.
I have now corrected the wikidevi link in the dataentry, resulting in working links for both wikidevi.wi-cat.ru and techinfodepot.