It is, yes.
But, a penalty try can only be awarded if an offence prevented a try from being scored.
The issues around try scoring are many.
If a try is cored, pretty much any offence, no matter how heinous, seems to be overlooked or ignored. It may be that the rules dictate this is so. A modern day referee would have to confirm.
Let us take a not unlikely scenario. A winger gets the ball 5 out, near touch. Despite a head removing and dangerous high tackle, the winger gets it down before being blatted in to touch.
Worse, as he hits the ground, another defender piles in with their knees to his head.
From what I have seen over the last few years, no action would be taken on the pitch. The two defenders might get cited, or they might not.
My view is that if an offence is committed whilst attempting to prevent a try, or at the point of a try being committed, or even afterwards, the try would still be awarded to the scorer, but changed to a penalty try, and the perpeptrator(s) given at least a yellow, if not a red.
Similarly, when considering if an offence prevented a try within the 22m, and whether a penalty try should be awarded, the presumption should be that the try would have been scored, unless the situation was that it clearly would NOT have been.
Finally, with regard to consecutive penalties in the 5m 'red zone', two consecutive penalties should result in a penalty try and yellow. There needs to be an examination of whether the majority of scrum penalties should instead be a free klick, with no option to revert to a scrum.
And, during the match. Twice a Sale player ran or moved towards, well within the 10m, to try and charge down a kick. Surely that cannot be right? One was at Dan's quick tap over under the posts, the other at Jimmy somewhere near the bench as he kicked to touch. Both were less than 5m away when the penalty itself was taken.