Despite the interference, Zhou Tian can still use the Time Domain to his advantage in areas like acceleration. Given Zhou Tian's abilities, even minor deviations in speed can be compensated for by him.
However, if he uses the Time Domain to heal his injuries, he cannot guarantee that there won't be any problems.
Although Zhou Tian uses the Time Domain to heal in a very straightforward manner, simplicity does not mean recklessness. The use of the Time Domain is still a delicate matter; any accidents during its operation, like disruption affecting the flow of time, could lead to complications. In such a scenario, Zhou Tian's injuries might not only fail to recover but could possibly worsen due to unforeseen complications.
If Zhou Tian's injuries become more severe or fixate on a certain period, his situation might become worse than it is now.
So, although the Time Domain can still be used, Zhou Tian can't risk using it for healing until the interference from the enemy disappears.