Hi,
Deletion of changelog may won't create any issues if your delta data was properly loaded to further targets from this DSO.
In future if you face delta records issue, if we didn't deleted change log data then we do the selective from dso to further targets. if we deleted changelog then we need to reload from PSA or From source.
Delta type never cause any issues if we delete the changlogs( where delta data was moving properly to connected targets).
Thanks