What I think they have shown with the arrow is MH370 LKP. If they think it is returning from the east what did they think seeing it so far west?
The plot shows segments of a route from Penang thru a danger area direct to VAMPI and further on N571 to IGOGU. This is the last recorded segment West of Malaysia. The LKP is East of Malaysia. Penang is about 220 NM from IGARI or 30 flying minutes.
The plot was shown on a presentation to the relatives. The route had been announced earlier albeit with a Z turn southwest of Penang which can not be seen here. This may have been another airplane that was identified in the meantime.
The Prime Minister had addressed during his press conf that the determination that the trace would belong to flight 370 was made independantly by Malaysian and several foreign agencies.
The plot is from raw primary data therefore no tags or so. The map is overlaid for the presentation.
There are holes in primary radar coverage which speak about the quality of the Butterworth radar. The radar can be seen here 5.462348, 100.387213. It looks more like an elevated ASR than a long range defense radar. The quite long radar traces also speak in favour of a fast turning device, also the cone of silence above Penang. The 4 people sitting in the radar room of Butterworth that night probably had no defense duties but were approach controllers, my guess