Is the 'r' in 'tri' normally rolled or not? This example seems to lack the rolled (trilled) 'r' and sounds more like the word 'tree' from the southern English dialects.
If you can trill, then trill. If not, don't worry - not everybody is able to, and not everybody who is able to do it does it to the same degree. The main thing is to pronounce r and rh somehow, if you can, rather than miss it out altogether as in some English dialects.