Would have to see the entire plant / leaves / any flowers itself to be sure, but, yes, could certainly be Araujia also ..If it is growing in his local botanical garden..
Seeds / seedpod similarity to Milkweeds = same family / tribe as Milkweeds ( Asclepiadeae ) but different subtribe than Asclepias itself ( Araujia = Subtribe Oxypetalinae )
A side note: Aside from Asclepias itself, Overall family contains numerous native " Vining Milkweeds " here in the U.S. / Mexico: Funastrum, Gonolobus, ** Sacrostemma / **Cynanchum, Matelea, Vailia, Marsdenia, etc.. Monarchs / Queens / other Butterfly sps in Mexico use some of these as larval hosts also.
None are " weeds "