The context is that the author of the tweet hates fast paced open research (which IMO is a net good for humanity) and makes up the strawman `"can't keep up" + "

The context is that the author of the tweet hates fast paced open research (which IMO is a net good for humanity) and makes up the strawman `"can't keep up" + "anything older than 6 months is irrelevant" in CS` quotes to justify that position. There's timeless beauty in CS, but there's also a lot more fertile ground for research in CS, given how young the field is compared to the older sciences.