It actually is. TS is like a force multiplier for shit devs. All the worst code I've ever seen has been in TS and within the last 5 years. The average code quality has fucking plummetted in that time too, it's not just the worst offenders.
I'd argue it's not actually TS that causes this. There are just a lot of unskilled devs.
You mention "within the last 5 years" without also taking into account the absolute explosion in the popularity of becoming a software dev in the last 10 years. So of course theres going to be a lot of bad (and some good) devs. With TS being one of the literal most popular languages in use right now, of course a lot of bad code will be concentrated there, but I wouldn't blame TS itself for it.
You can also blame hiring practices somewhat for it, since a lot of places I've worked for even myself recently hire anybody who can recite a couple ECMA features rather than focusing on good dev practices in general.
