Rachel's English tells us not to pronounce the 't' near the end of such words as "twenty" and "wanted."
I think her basic observation is correct. People in England do pronounce the 't' in an audible way, but it is harder to hear a 't' sound in these words in casual speech by Americans.
One reason why we might not be able to hear the 't' sound is because the speakers are closing their vocal cords, shutting off all sound for a split second. This is called t-glottalization.
https://en.wikipedia.org/wiki/T-glottalization
The British phonetician John Wells points out that it is quite common for both British and Americans to switch 't' for a glottal stop at the end of a syllable in some phonetic environments.
certain /sǝɹʔn/
winter /wɪnʔr/
http://phonetic-blog.blogspot.com/2010/07/jarek-weckwerth-commenting-on-fridays.html
Checking on the website Forvo, we do find some speakers uploading these pronunciations even in quite careful readings.
Some of the commenters below Rachel's video say that they can hear the 't' or pronounce it themselves, so maybe this glottal stop is what they hear or are saying.
Another possibility is that the speakers are making a 't' closure, but there are not releasing it.
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