HDB property value did not fall in opposition ward

(source)

I find it strange PAP keep harping WP win will result in HDB price to fall. But if one looks at the HDB records on the HDB website, one can see HDB flats in Hougang Ave 5 which is the heart of Hougang SMC, the prices of the 4-room flats that transacted there are not much different from Hougang Ave 8 which was run by George Yeo's Aljunied GRC. The prices for the last 12 months are as follow:

Hougang Ave 5 3rm flat : ranging from $245K to $330K (WP)

Hougang Ave 8 3rm flat : ranging from $220K to $326K (PAP)

Hougang Ave 5 4rm flat : ranging from $305K to $420K (WP)

Hougang Ave 8 4rm flat : ranging from $290K to $420K (PAP)

Hougang Ave 5 5rm flat : ranging from $340K to $527K (WP)

Hougang Ave 8 5rm flat : ranging from $390K to $496K (PAP)

Looking at the above figure, I fail to comprehend how did PAP come up with the logic that WP run h\Hougang HDB flat worth less than the same across the road in the PAP run estate. The figure above are not bullshit, all taken from HDB resale e-service. On the whole, WP's Hougang worth more than PAP's Hougang. In fact, i use Hougang Ave 8 as comparison place Hougang ave 5 at a disadvantage as Hougang Ave 5 were built in 1983 while Ave 8 were built in 1986, some even in 1992.

So can PAP explain why people are paying more to buy a older flat in a "slum" while pay less for the newer flat in a "world class estate" run by the PAP?

http://services2.hdb.gov.sg/webapp/BB33RTIS/BB33PReslTrans.jsp

Feel free to click on the link to check, all the figures are from HDB website