Read the sporting meaning first
The organiser’s format guide uses live match for a contest played before one nation has accumulated the wins needed to settle the tie. It also explains the older term dead rubber for a match played after the national-team outcome has already been decided.
This terminology concerns what the individual result can still change. An archived match can accurately be described as having been live within the tie when it was played. Conversely, a broadcaster can transmit a post-decision match live even though it no longer decides which nation wins the tie.
Identify the winning threshold for that level
Davis Cup uses different structures at different levels. The official guide describes three-match ties at one-location events such as the Final 8, and five-match home-or-away ties over two days. Establish which format applies before deciding whether another singles or doubles match can settle the national contest.
For example, one nation having won the first two individual matches has a different significance in a best-of-three tie from the same position in a best-of-five tie. This is a comparison of the published structures, not a prediction of whether every remaining scheduled match will be played.
Verify the video’s time status separately
For the media question, inspect the publisher’s actual label, original match date, programme start and replay controls. A sporting preview using the word live does not establish the current status of an embedded video. Keep the original competition date even when the replay was uploaded later.
When reporting a confusing listing, explain whether the problem is a video labelled live that appears to be a replay, or a match called live despite an apparently settled tie. Include the competition level and national tie score for the second question. Separating those meanings prevents a sporting term from being treated as evidence of stream delay or a player fault.