Pings at the same time go well and have a realistic response time, apparently, only UDP is blocked.
For 45.133.181.66, on my tested network, outgoing TCP packets are also dropped at the TSPU hop. incoming TCP packets (spoofed) passed through.
This is very similar to another IP which is also blocked by TSPU (outgoing packets dropped at the TSPU hop, incoming packets unaffected). The difference is that for the other IP, ICMP echo is also dropped in addition to TCP.