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That just means 30-39. Probably would be clearer if written 30's. The ms is implied, due to the context.

That would be a greengrocer's apostrophe.

what is clearer about implying the 30 posseses something? the post said 'low 30s', so to me that would imple 30-35, or even 30-33 if one wanted to call 34-36 mid 30s and 37-39 high 30s.

I don't think it meant "ms" specifically, it meant in the range of 30-40 ms; the milliseconds was implied from the context.

Internet connection speeds, in context. Latencies faster than milliseconds are not found in home internet connections (or anywhere maybe?) and 30 second latencies in Starlink would have prevented the product from even existing or would imply faulty hardware.