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We cannot answer for Terracotta, you would need to check with them as to support for tc Server. However, as background, 6.0.19 (as included in tc Server) is a maintenance update to 6.0.18 (which Terracotta lists support for), so we see no reason why it shouldn't work or be supported by Terracotta.
Additionally, Apache decided not to officially put out 6.0.19 as a release and have recently released 6.0.20 as the latest 6.0.x release. Look for a tc Server maintenance update in the near future to upgrade to the 6.0.20 release. Like 6.0.19, it's upward compatible from 6.0.18 so "should" run and be supported by Terracotta, but you'll need to check with them for final word.