It's not.

The ASN was assigned by RIPE in Sep 2019.

On Fri, Jul 23, 2021 at 3:20 PM Suresh Ramasubramanian <ops.lists@gmail.com> wrote:
This is probably an ex afrinic stolen block?

In which case it’s for afrinic to sort out and reclaim 

--srs

From: NANOG <nanog-bounces+ops.lists=gmail.com@nanog.org> on behalf of Siyuan Miao <aveline@misaka.io>
Sent: Friday, July 23, 2021 12:38:16 PM
To: North American Network Operators' Group <nanog@nanog.org>
Subject: Spamhaus ASN-DROP list
 
Hi All,

One of our ASNs has been listed in the Spamhaus ASN-DROP list before it was assigned to us. 

We emailed them last year but didn't get a response. Could anyone from Spamhaus contact us off the list?

Best Regards,
Siyuan