Archaeology celebrated in Senedd - ignoring destruction of major site at Five Mile Lane

A Short debate 5^th December in the Senedd on The Neolithic in the Story of Wales: Valuing the achievements of prehistory (NDM6891) was led by David Melding, AM for South Wales Central.  neolithic = later Stone Age ranging from around 4,500BC to 1,700BC.  David Melding began:

“I want to start with Tinkinswood in the Vale of Glamorgan. It is one of my favourite places. I’ve walked there and spent time there, read poetry there, discussed eruditely, I hope, with some Members in this Chamber, indeed, whilst pondering and looking at that monument. It does remind me, anyway, of the amazing achievements of our ancestors in prehistory. I believe it is really important that we respect and celebrate these achievements.”

https://seneddhome.com/2018/12/david-melding-rocks-senedd-back-to-the-stone-age

So how no mention of the Five-Mile-Lane site, a few km from Tinkinswood, which all authorities including CADW and the GlamGwent Archaeological Trust allowed to be bulldozed this year, despite initial investigations showing a wealth of structures and burial sites? 

The commissioned archaeologists and GGAT got their fees and kept findings quiet till late on, so the WG-bulldozers could complete their work and the VoG Council could claim "too late" to change the new roadway plans.   https://jacothenorth.net/blog/tag/five-mile-lane/

How could the Senedd debate the general matter without recognising the crime on their watch?

Archaeology major discovery and destruction of remains
video  https://youtu.be/o2CRUv8eexc    Narrator: Karl-James Langford
Facebook site:   Barry destroyed heritage at Five Mile Lane
http://www.barryanddistrictnews.co.uk/news/16163151.Ancient_artifacts_from_3500BC_discovered_at_Five_Mile_Lane/

A wide range of very significant evidence for the archaeology and history of the area from early prehistory (3500BC) through to the Roman period (1st to 4th centuries AD). Finds include:
• Prehistoric Bronze Age barrows (burial mounds) and cremations
• Prehistoric Iron Age settlement enclosure with roundhouses and field system
• Roman metalworking site - Iron smelting and smithing
• Roman villa previously excavated in the 1960s and 1970s